Radial piston pump, especially radial piston compressors

Description

[0001] The present invention relates to a radial piston pump, in particular a radial piston compressor, according to the preamble of claim 1.

[0002] A radial piston pump is a component of fluid power technology. In this type of pump, also known as a radial piston pump, the piston-working chamber combinations are arranged radially and perpendicular to the drive shaft, unlike in an axial piston compressor. The pumping or stroke motion of each individual working piston is generated by an eccentric located on the drive shaft. A radial piston pump typically comprises several piston-working chamber combinations radiating outwards from the drive shaft in a star-shaped pattern. The radial piston pump pumps a fluid from a low-pressure chamber to a high-pressure chamber.

[0003] Radial piston pumps are used, for example, as compressors for refrigerants in the air conditioning systems of motor vehicles, especially in electric vehicles. A radial piston pump can also be referred to as a radial piston compressor or refrigerant compressor based on the radial piston principle.

[0004] In this context, it is provided that a cover is positioned at the top of the work area or closes it off. The cover is subjected to the pressures prevailing in the work area and must be secured accordingly.

[0005] According to current technology, the cover is screwed on, for example. It is obvious that the assembly effort is considerable if all covers of a radial piston pump with multiple piston-working chamber combinations have to be fitted.

[0006] In a patent application, the applicant proposes using a common retaining ring to secure all covers of the radial piston pump. To ensure sufficient radial clearance between the housing component and the retaining ring, the inner diameter of the housing component must be larger than the outer diameter of the retaining ring by the amount of this clearance. This results in a relatively large radial installation space for the overall component.

[0007] From EP 0 520 286 B1, for example, a radial piston pump is known, comprising a drive shaft with an eccentric, and at least one piston-working chamber combination, wherein the piston-working chamber combination comprises a working chamber and a piston, wherein the radial piston pump comprises at least two piston-working chamber combinations extending radially from the drive shaft, each working chamber being closed with a cover, and wherein the radial piston pump is equipped with a housing component for fixing all covers of the radial piston pump.

[0008] Other radial piston pumps are known, for example, from EP 0 522 116 B1 and CN 102 439 312 A.

[0009] Although a solution that is easy to assemble is already proposed here, there is still room for improvement, especially regarding the required space.

[0010] This is where the present invention comes in, and it aims to propose an improved radial piston pump, in particular a radial piston pump that is easy to assemble but also tends to require less space.

[0011] According to the invention, this problem is solved by a radial piston pump with the characterizing features of claim 1. By equipping the radial piston pump with a housing component that has an integrated retaining ring for securing all the pump's covers, a very space-saving radial piston pump can be provided. In other words, the function of the retaining ring for securing the covers is integrated into a separate housing component. The invention achieves that only one component provides the holding force for the covers and is simultaneously part of the radial piston pump housing, resulting in a reduction and / or simplification of the components. A particular advantage of this integration is that the covers do not need to be screwed on, thus saving work steps and eliminating the need for components for securing the covers, such as screws, retaining rings, etc.Furthermore, a reduction in the radial installation space of the overall assembly can be achieved. In particular, the housing screw connection can be positioned further inwards, i.e., on a smaller bolt circle, thus radially reducing the outer diameter of the overall assembly. A reduction in radial installation space is also possible with a retaining ring. This results in a smaller pressurized diameter, consequently a smaller surface area, and therefore a lower required axial force.

[0012] This allows for smaller screw dimensions. Reducing the pressurized inner diameter leads to a reduction in the contact area and thus to a lower axial force. A lower axial force, which pushes the housing parts apart, means a lower operating force on the housing screw connection. Fewer housing screws also result from the fact that a smaller diameter means less axial force compared to a retaining ring. Advantageously, this also results in a lower load on the axial screw connection of the housings, potentially leading to cost reductions through the use of fewer screws, screws with lower strength, or screws with a smaller diameter. Furthermore, the pressurized area within the axial sealing surfaces, especially in the axial direction of the overall component, is smaller.An advantageous side effect of the invention is the reduction of the overall screw force; in particular, due to the reduction of the radial installation space, the pressurized area within the housing sealing surfaces is reduced. A reduced area means a correspondingly reduced force at the same pressure.

[0013] Further advantageous embodiments of the proposed invention arise in particular from the features of the dependent claims. The subject matter or features of the various claims can, in principle, be combined with one another in any way.

[0014] In an advantageous embodiment of the invention, the radial piston pump may comprise at least three, preferably eight, piston-working chamber combinations arranged in a star shape around the drive shaft. Accordingly, many piston-working chamber combinations can be combined in a compact radial piston pump.

[0015] In a further advantageous embodiment of the invention, the radial piston pump may have at least one further housing component, in particular a high-pressure housing, a cylinder housing, in particular for accommodating the piston-working chamber combinations, and / or a stator housing, in particular for accommodating a rotor of an electric motor, wherein the housing component with integrated retaining ring and the further housing component(s) form the housing of the radial piston pump. It is generally provided that the housing component with integrated retaining ring and the further housing components form the housing of the radial piston pump. Accordingly, the housing components combine to form a complete housing and a correspondingly compact radial piston pump.

[0016] In a further advantageous embodiment of the invention, the housing component with integrated retaining ring can have axially parallel sealing surfaces. Sealing surfaces designed in this way provide a tight connection to the adjacent housing component, such as the cylinder housing.

[0017] In a further advantageous embodiment of the invention, the surfaces of the sealing surfaces of the housing component with integrated retaining ring can be provided with concentric grooves, in particular with a waviness in the radial direction. The concentric groove(s) can further improve the sealing effect.

[0018] In a further advantageous embodiment of the invention, it can be provided that contact surfaces are provided on the housing component with integrated retaining ring and on the cover, wherein the contact surfaces are preferably designed in such a way that the housing component with integrated retaining ring can fix the cover to the cylinder housing.

[0019] In a further advantageous embodiment of the invention, the contact surface to and / or of the respective cover can be designed to be planar or concave / convex, wherein the curvature of the cover or the housing component with integrated retaining ring can preferably run axially to the compressor shaft and / or transversely thereto. Such a design of the contact surfaces ensures improved retention of the cover by the housing component with integrated retaining ring.

[0020] In a further advantageous embodiment of the invention, the cover and / or the housing component with integrated retaining ring can have an overlap in the joining diameter, particularly in the area of ​​the cover on the cylinder housing, resulting in an interference fit between the cover and the housing-integrated retaining ring. This overlap, also referred to as interference, can be used to create or maintain an interference fit by utilizing a certain degree of elasticity in the housing component with integrated retaining ring. The joining diameter refers to the "common" diameter between the cover and the retaining ring, which, with its interference fit design, ensures the function of securing the cover.

[0021] In a further advantageous embodiment of the invention, a screw may be provided for connecting all housing parts. This enables simple and quick, since simultaneous, screwing of all housing components to each other.

[0022] In a further advantageous embodiment of the invention, the housing component with integrated retaining ring can be made, at least partially, of steel or a steel alloy. Such a material selection advantageously meets the high strength requirements of its function as a retaining ring (surface pressure against the cover).

[0023] In a further advantageous embodiment of the invention, a surface contact between the cover and the housing component with integrated retaining ring can be provided. A surface contact allows for optimal force transmission and correspondingly low or minimal point load.

[0024] In a further advantageous embodiment of the invention, the housing component with integrated retaining ring and the cover can have at least partially corresponding shapes. This allows for an optimal positive fit between the housing component with integrated retaining ring and the cover(s). An optimized surface area means, for example, better distribution of forces and / or less deformation of the cover.

[0025] In a further advantageous embodiment of the invention, the housing component with integrated retaining ring can have at least one passage for the housing screw connection, wherein the passage for the housing screw connection is either interrupted to the inside or designed as a fully enclosed passage. While the variant with the interrupted passage is characterized by a smaller installation space requirement, a fully enclosed passage provides a good seal against internal pressure.

[0026] In a further advantageous embodiment of the invention, at least one, preferably two, positioning means, in particular positioning bores, can be provided in the housing component with integrated retaining ring. This ensures that the housing component with integrated retaining ring is always mounted in a predetermined position. Furthermore, assembly is simplified because the angular position does not need to be determined for each assembly operation.

[0027] The radial piston pump, and in particular the radial piston compressor, proposed here can preferably be used as an air conditioning compressor, preferably with an electric motor as the drive. The fluid is accordingly preferably a refrigerant.

[0028] Further features and advantages of the present invention will become clear from the following description of preferred embodiments with reference to the accompanying figures. These show Fig. 1 a radial piston pump with a separate retaining ring in a sectional view; Fig. 2 a radial piston pump according to the invention in a sectional view; Fig. 3 a radial piston pump with a separate retaining ring in a front view; Fig. 4 a radial piston pump according to the invention in a front view; Fig. 5 a radial piston pump according to the invention in a longitudinal section view; Fig. 6 a radial piston pump according to the invention in a transverse section view; Fig. 7 a housing component of a radial piston pump according to the invention; Fig. 8 a housing component of a radial piston pump according to the invention; Fig. 9 a housing component of a radial piston pump according to the invention; Fig. 10 an enlarged view of a region of a housing component according to Fig. 8 Fig. 11 a schematic representation of the fluid flow of a radial piston pump according to the invention; Fig. 12 a schematic representation of the fluid flow of a radial piston pump according to the invention; Fig. 13 a schematic representation of the fluid flow of a radial piston pump according to the invention; Fig. 14 a radial piston pump according to the invention in a sectional view.

[0029] The following reference symbols are used in the illustrations: Longitudinal axis Fluid D Range Da_Geh1 Outer diameter of a radial piston pump with separate retaining ring Da_Geh2 Outer diameter of the radial piston pump according to the invention Di_Geh 1 Inner diameter of a radial piston pump with separate retaining ring Di_Geh 2 Inner diameter of the radial piston pump according to the invention 1 Drive shaft 2 (a - g) Piston-working chamber combination 3 High-pressure housing 4 Cylinder housing 5 Housing component with integrated retaining ring 6 Stator housing 11 Eccentric 21 Working chamber 22 Piston 23 (a - g) Cover 24 Inlet valve 25 Exhaust valve 26 Gasket 27 Screw 51 Retaining ring 52 Sealing surface 53 Contact surface (on the housing component) 54 Positioning means, in particular positioning bore 55 Through-hole (for the housing screw) 231Contact surface (on the lid) 241Fluid inlet 251Fluid outlet 252High-pressure fluid channel 521 groove

[0030] Features and details described in connection with a method naturally also apply to the device according to the invention, and vice versa, so that the disclosure regarding the individual aspects of the invention always makes or can make reciprocal reference. Furthermore, any described method according to the invention can be carried out with the device according to the invention.

[0031] The terminology used herein serves only to describe certain embodiments and is not intended to limit the disclosure. As used herein, the singular forms "a" and "the" shall also include the plural forms unless the context otherwise makes clear. It shall also be clear that the expressions "indicates" and / or "indicating," when used in this description, specify the presence of the aforementioned features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the expression "and / or" includes any and all combinations of one or more of the associated, listed elements.

[0032] First, the focus will be on Fig. 2 and 4Reference made to.

[0033] A radial piston pump essentially comprises a drive shaft 1 with an eccentric 11, and at least one piston-working chamber combination 2, which is housed in a cylinder casing 4. To define the axial direction, a longitudinal axis L of the drive shaft 1 is defined in the Fig. 5 The piston-working chamber combination 2 essentially comprises a working chamber 21 and a piston 22. The working chamber 21 is closed at the head end or piston head end with a cover 23.

[0034] The radial piston pump typically comprises at least two piston-working chamber combinations 2, 2a, 2b, ... extending radially from the drive shaft 1. Preferably, the radial piston pump comprises at least three, and preferably six, piston-working chamber combinations 2, 2a, 2b, ... extending radially from the drive shaft 1. Each piston-working chamber combination 2, 2a, 2b, ... is provided with a cover 23, 23a, ... . The piston-working chamber combinations 2, 2a, 2b, ... are preferably all enclosed in the cylinder housing 4.

[0035] Furthermore, a fluid inlet 241 is provided in the cover 23 or at the head end of the working chamber 21. A fluid outlet 251 is also provided in the working chamber 21, preferably in the wall of the working chamber 21. The fluid inlet 241 is equipped with an inlet valve 24, which can selectively close or open the fluid inlet 241. The fluid outlet 251 is equipped with an outlet valve 25, which can selectively close or open the fluid outlet 251. Alternatively, the fluid inlet 241 or the inlet valve 24 can also be provided in the piston 22, in particular in the piston head. For example, this could be achieved by... Fig. 10 be referred.

[0036] The fluid F to be compressed flows into the working chamber 21 via the fluid inlet 241 or the inlet valve 24, is compressed there by the stroke of the piston 22, and leaves the working chamber 21 through the outlet valve 25 or the fluid outlet 251. Here, for example, the Fig. 11 und 12 Reference is made to the schematic representation of the flow path. The design of the valves, for example as spring-loaded valves, is sufficiently known to those skilled in the art and requires no further explanation here.

[0037] According to the invention, the radial piston pump is provided with a retaining ring 51 integrated into a housing component 5 for all covers 23, 23a, ... of the piston-working chamber combinations 2, 2a, 2b, ... .

[0038] To clarify the difference to a separate retaining ring, refer to the Fig. 1 and 3Reference is made to the diagram, which shows a separate retaining ring for all the covers of the piston-working chamber combinations. By comparing the above-mentioned illustrations, Fig. 1 and 3 on the one hand and Fig. 2 and 4 On the other hand, the effect on the outer diameter of the entire assembly becomes apparent. It is clear that in the inventive design with a housing-integrated retaining ring, see in particular... Fig. 2 and 4 , the outer diameter Da_Geh2 is smaller than in the variant with a separate retaining ring and its outer diameter Da_Geh1, see in particular Fig. 1 and 3 .

[0039] Advantages also arise with regard to the inner diameter of the radial piston pump according to the invention. For example, the Fig. 3 und 4 the inner diameters of the housings of both variants, on which a low pressure p_ND is applied (see in particular Fig. 5 ) is effective. It can be seen that, in addition to the outer diameter, the inner case diameter of the variant "case-integrated retaining ring" Di_Geh 2 is also smaller than the diameter Di_Geh 1 of the variant "separate retaining ring".

[0040] The larger inner diameter of the "separate retaining ring" variant results in a greater axial force (at the same pressure). A greater axial force means a greater load on the housing screw connection, particularly a higher operating force on the screws. To maintain the sealing effect, especially axially between the housing parts, the screw preload would have to be increased, a higher-strength screw material would have to be used, and / or the number of screws would have to be increased. All these measures would lead to an increase in costs. The inventive solution of the housing component with an integrated retaining ring offers advantages here, since smaller internal surfaces can be expected or are possible, and correspondingly lower forces are to be expected.

[0041] Especially in Fig. 5 The housing components of the radial piston pump are shown. It is preferably provided that the radial piston pump has at least one further housing component, wherein the housing component 5 with integrated retaining ring 51 and the further housing component(s) form the housing of the radial piston pump. The radial piston pump shown here as an example preferably consists of a total of four housing components, which are preferably screwed together axially. A radial piston pump according to the invention comprises, for example, a high-pressure housing 3, the cylinder housing 4, in particular for receiving the piston-working chamber combinations (2, 2a, 2b, ...), the housing component 5 with integrated retaining ring 51, and a stator housing 6, in particular for receiving a rotor (not shown) of an electric motor.The axial screw connection, preferably a screw connection in the axial direction, which connects all housing parts together, is preferably designed to ensure the sealing effect to the environment between the housing components, see in particular . Fig. 5 .

[0042] Preferably, the housing component 5 with integrated retaining ring has plane-parallel axial sealing surfaces 52 to ensure the sealing requirements with the adjacent housing parts. Preferably, the surfaces of the sealing surfaces 52, at least in region D, are provided with concentric grooves 521, in particular with a waviness in the radial direction. Preferably, the grooves 521 are designed in the micrometer range, especially in the sealing area facing outwards. Here, in particular, Fig. 10 be referred.

[0043] In a further advantageous embodiment of the invention, the housing components 3, 4, 5, 6 can be screwed together to form the pump housing. Preferably, the housing components are screwed together using a screw 27. For this purpose, the cylinder housing 4 can have a flange 28 or the like, which serves for screwing it to the other housing components. The cylinder housing can also have a sealing surface 52.

[0044] Preferably, fluid channels of the radial piston pump, or at least sections of fluid channels, can be formed by means of the screwed-together housing parts. One such compound channel is, for example, the high-pressure channel 252.

[0045] The housing components 3 to 6 can define and seal different pressure zones within the radial piston pump or to the outside. In a further advantageous embodiment of the invention, the housing component can be provided with axially parallel sealing surfaces. Sealing surfaces designed in this way can provide a tight connection to the adjacent housing component, such as the high-pressure housing 7 or the stator housing 8.

[0046] Furthermore, it may be provided that 52 seals are arranged between the sealing surfaces, either additionally or exclusively.

[0047] In a further advantageous embodiment of the invention, the surfaces of the sealing surfaces 52 may have one or more geometric shapes that deviate from a flat or approximately flat surface. For example, at least one of the sealing surfaces 52 may have a concave or convex shape to selectively form contact surfaces or line contacts. Thus, a flat sealing surface 52 of one housing component can be brought into contact with the convex surface or sealing surface 52 of another housing component, thereby creating a seal. By contacting a flat and a convex surface, a defined line contact is advantageously formed between the two surfaces. Such a line contact can preferably function as a seal between the corresponding components, either wholly or at least partially.Advantageously, one of the surfaces can exhibit elastic behavior, so that fluctuations in the distance between the components can be compensated for by the elasticity.

[0048] Preferably, contact surfaces 53 are provided on the housing component 5 with integrated retaining ring 51 and contact surfaces 231 on the cover 23, wherein the contact surfaces are preferably designed such that the housing component 5 with integrated retaining ring 51 can fix the cover 23 to the cylinder housing 4, in particular axially and / or radially, i.e. against pressure from the working space 21.

[0049] Furthermore preferably, the cover 23 and the housing component 5 with integrated retaining ring 51 have an overlap in the joining diameter, particularly in the area of ​​the cover 23 on the cylinder housing 4, so that a press fit is achieved between the cover 23 and the housing-integrated retaining ring 51.

[0050] Preferably, one screw is provided for joining all housing parts; in other words, the housing parts are joined with a single screw, as shown in Fig. 14 The figure shows a section of a longitudinal section of a radial piston pump according to the invention. Quick assembly is possible when all housing components are screwed together using a single screw, as no additional screws are required between them.

[0051] Advantageously, for example, the cylinder housing 4 and the housing-integrated retaining ring 5 can form a pre-assembled assembly or module for assembly. The housing part 5 with the housing-integrated retaining ring 51 directly secures all covers 23 to the cylinder housing 4. The housing parts or the pre-assembled modules can be aligned with each other and then screwed together with at least one screw 27. Another advantage resulting from the use of the housing component 5 as a separate part is the pre-assembly (without screws) of an assembly comprising the housing component 5 and the cylinder housing 4 (preferably with cover 23 and the valves 24, 25, piston and, if applicable, seals). This assembly can then be easily screwed to the other housing components and the radial piston pump can be fully assembled. A further advantage is the resulting modularity. The housing components orThe housing of the radial piston pump can be manufactured, for example, using injection molding or die-casting processes. If a radial piston pump with a different cylinder layout is desired, e.g., a different cylinder volume or a different cylinder arrangement / number, the installation space requirement in the axial direction of the radial piston pump generally also changes. The individually adapted housing component 5 can, for example, accommodate a changing axial installation space requirement of such a modified cylinder housing 4. As long as the contact surfaces or sealing surfaces remain unchanged, the other housing components can be used without modification. Thus, a modular radial piston pump, scalable in its axial length (or performance), can be designed using the housing component 5 with integrated retaining ring 51. The housing component 5 can also be understood as a housing ring or spacer. Further details can be found in the [reference to be added]. Fig. 14 depicted.

[0052] Preferably, the housing component 5 with integrated retaining ring 51 should be joined at an angle to the cylinder housing 4 so that the passages for the housing screw(s) align with each other and the screws can be inserted, or so that the contact surfaces 231 and 53 of the cover 23 correspond to the retaining ring 51. For this purpose, the housing component 5 with integrated retaining ring 51 can be provided with at least one positioning element, in particular a positioning bore. The cylinder housing 4 has a corresponding positioning element, for example in the form of a pin. The positioning element 54 of the housing component 5 serves in particular to align the integrated retaining ring 51 at an angle to the joining device. The cylinder housing should be fixed at an angle in the mounting recess, for example at the clamping lugs or by another type of geometry.Automated assembly can then join the two housing parts at the correct angle. This angular orientation is recommended due to the arrangement of the contact surfaces between the cover 23 and the integrated retaining ring 51.

[0053] This ensures, for example, that the housing component 5 with integrated retaining ring 51 can be inserted at the correct angular position during assembly, for instance, for insertion into the gripper of the tool. Furthermore, it is advantageous to provide the housing component 5 with integrated retaining ring 51 with a second positioning means, in particular a second positioning bore 54. A second positioning bore, especially with an angular offset of other than 180° to the first positioning bore, is particularly advantageous if, for example, the retaining ring 51 has a chamfer or rounding on one side of its inner ring edge, which facilitates the insertion of the retaining ring 51. The second, offset positioning bore ensures that the housing component 5 with integrated retaining ring 51 is always installed at the correct angle.

[0054] The second positioning hole can be on a different bolt circle than the first hole, with the advantage of reliable angular alignment. This also prevents the housing component 5 from being installed upside down (rotated 180° around its vertical axis) if it has a chamfer on one side for joining.

[0055] In another embodiment, three holes are provided, one of which is arranged on a different radius or pitch circle. The advantage, as mentioned above, is the clearly angular orientation and the correct side assignment for the housing component.

[0056] It may also preferably be provided that the cover 23 has the inlet valve(s) 24.

[0057] Preferably, the housing component 5 with integrated retaining ring 51 should be made at least partially of steel or a steel alloy, but at least the retaining ring 51 as such should be made of steel or a steel alloy, so that it advantageously meets the high strength requirements of its function as a retaining ring (surface pressure to the cover).

[0058] All materials and / or manufacturing processes known from the state of the art, such as casting, turning or milling (coarse and fine), are suitable as material and / or manufacturing process for the housing component 5 with integrated retaining ring 51.

[0059] It may also preferably be provided that the contact surface of the cover and / or the associated contact surface of the housing component with integrated retaining ring is planar or concave / convex, wherein the curvature of the cover or the housing component with integrated retaining ring may run axially to the shaft of the compressor and / or transversely thereto.

[0060] It may also preferably be provided that a surface contact is provided between the cover and the housing component with an integrated retaining ring.

[0061] It may also preferably be provided that a compensation of tolerances between the cover and the housing component with integrated retaining ring is provided.

[0062] It may also preferably be provided that the housing component with integrated retaining ring and the cover have at least partially corresponding shapes.

[0063] Possible designs of the housing component with integrated retaining ring, in particular its passages for the housing screws, are shown especially in the Fig. 7 bis 9 depicted.

[0064] In the Fig. 7 One variant is shown, for example, in which the passage 55 for the housing screw connection is interrupted to the inside. The passages are located inside the ring next to the area where the cover rests. The housing component 5 with integrated retaining ring 55 preferably has two axially parallel contact surfaces that form the sealing surface with the adjacent housing parts. The arrows show, by way of example, the contact points for contact with the cover. Eight contact points are provided here, so that eight covers can be fixed with the housing component with integrated retaining ring shown here. The variant sketched here is characterized in particular by a smaller installation space requirement, especially by the absence of any enclosure around the screw passages / bores.

[0065] In the Fig. 8 A housing component with an integrated retaining ring and a stress-optimized interruption for the screw holes is shown. For illustrative purposes, arrows point to possible contact points on the cover. The variant sketched here is characterized in particular by its smaller installation space requirement, especially due to the lack of enclosure around the screw holes.

[0066] In the Fig. 9 Figure 5 shows a housing component with an integrated retaining ring 51 and fully enclosed passages for the screw connection. For illustrative purposes, arrows point to possible contact points with the system on the cover 23. The variant sketched here is characterized in particular by the fact that no pressure is exerted between the screw and the screw hole. This means that the screw hole is already sealed by the refrigerant within the compressor. An additional seal, e.g., under the screw head, is generally not required.

[0067] In particular Figur 14 Figure 3-6 shows the simultaneous screwing together of all housing components. Fig. 14 This is part of a longitudinal section through the radial piston pump; the section was deliberately positioned this way (path indicated in Fig. 6The screw connection is shown. This means that the cover 23 and the required inlet valve are not shown. It is clear that the screw must not obstruct the inlet opening. As can be seen from the figures, the screw connection is preferably located next to the contact surfaces between housing component 5 and cover 23 in order to reduce the radial installation space. In principle, it is conceivable that the geometries of the integrated retaining ring are formed in the stator housing and that the stator housing integrates the function of housing component 5. Housing component 5 can be considered a kind of housing disc. The machining of the contact surfaces can be carried out over the entire length of the housing disc. If the functions of housing component 5, and thus the contact surfaces 53 with the cover 23, are formed on the stator housing 6, the machining is more complex and therefore more expensive.

Claims

1. A radial piston pump, in particular radial piston compressor, comprising - a drive shaft (1) with an eccentric (11), and piston / working chamber combinations (2, 2a, 2b), wherein each piston / working chamber combination (2, 2a, 2b) comprises a working chamber (21) and a piston (22), wherein - the radial piston pump comprises at least two piston / working chamber combinations (2, 2a, 2b, ...) extending radially from the drive shaft (1), wherein each working chamber (21) is closed with a cover (23 (a-g)), characterized in that the radial piston pump is equipped with a housing component (5) with an integrated retaining ring (51) for fixing all of the covers (23 (a-g)) of the radial piston pump.

2. The radial piston pump as claimed in claim 1, characterized in that the radial piston pump comprises at least three, preferably eight, piston / working chamber combinations (2, 2a, 2b, ...) which are arranged in a star shape around the drive shaft (1).

3. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the radial piston pump has at least one further housing component, wherein the housing component (5) with an integrated retaining ring (51) and the further housing component or components form the housing of the radial piston pump.

4. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the housing component (5) with an integrated retaining ring (51) has plane-parallel axial sealing faces (52).

5. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the surfaces of the sealing faces (52) of the housing component (5) with an integrated retaining ring (51) are provided with concentric grooves (521).

6. The radial piston pump as claimed in claim 5, characterized in that the concentric grooves (521) exhibit a waviness in the radial direction.

7. The radial piston pump as claimed in at least one of the preceding claims, characterized in that contact faces (53) are provided on the housing component (5) with an integrated retaining ring (51) and on the cover (23), wherein the contact faces (53) are preferably designed such that the housing component (5) with an integrated retaining ring (51) can fix the cover on the cylinder housing.

8. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the contact face (53) with respect to and / or of the respective cover (23) is flat or concave / convex, wherein the curvature of the cover (23) or of the housing component (5) with an integrated retaining ring (51) can preferably run axially with respect to the drive shaft (1) of the radial piston pump and / or transversely with respect thereto.

9. The radial piston pump as claimed in at least one of the preceding claims, characterized in that that the cover (23) and / or the housing component (5) with an integrated retaining ring (51) has an overlap in the joint diameter in the region of the cover (23) on the cylinder housing (4), such that an interference fit is produced between the cover (23) and the housing component (5) with an integrated retaining ring (51).

10. The radial piston pump as claimed in claim 9, characterized that the cover (23) and / or the housing component (5) with an integrated retaining ring (51) has the overlap in the joint diameter in the region of the cover (23) on the cylinder housing (4).

11. The radial piston pump as claimed in at least one of the preceding claims, characterized in that one screw is provided for the connection of all of the housing parts.

12. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the housing component (5) with an integrated retaining ring (51) consists of steel or a steel alloy at least in sections.

13. The radial piston pump as claimed in at least one of the preceding claims, characterized in that surface contact is provided between the cover (23) and the housing component (5) with an integrated retaining ring (51).

14. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the housing component (5) with an integrated retaining ring (51) and the cover (23) at least partially have mutually corresponding shapes.

15. The radial piston pump as claimed in at least one of the preceding claims, characterized in that the housing component (5) with an integrated retaining ring (51) has at least one passage (55) for the housing screw connection, wherein the passage (55) for the housing screw connection is interrupted inwardly or is designed as a fully enclosed passage for the screw connection.

16. The radial piston pump as claimed in at least one of the preceding claims, characterized in that at least two positioning means are provided in the housing component (5) with an integrated retaining ring (51).

17. The radial piston pump as claimed in claim 16, characterized in that the at least two positioning means are configured as a positioning bore (54) in the housing component (5) with an integrated retaining ring (51) respectively.