EP4337861A1

EP4337861A1 - Radial piston pump, in particular radial piston compressor

Info

Publication number: EP4337861A1
Application number: EP22727023.8A
Authority: EP
Inventors: Ulf MÜLLER; Tim Müller; Tony Stein
Original assignee: ThyssenKrupp AG; Thyssenkrupp Dynamic Components GmbH
Current assignee: ThyssenKrupp AG; Thyssenkrupp Dynamic Components GmbH
Priority date: 2021-05-10
Filing date: 2022-04-29
Publication date: 2024-03-20
Also published as: WO2022238149A1; US20240240627A1; CN117377825A; DE102021204716A1

Abstract

The invention relates to a radial piston pump, in particular a radial piston compressor, comprising a drive shaft (1) with an eccentric (11), and comprising at least one piston-working chamber combination (2), the piston-working chamber combination (2) comprising a working chamber (21) and a piston (22). The radial piston pump comprises at least two piston-working chamber combinations (2, 2a, 2b,…) which extend radially from the drive shaft (1), each working chamber (21) being closed by a cover (23(a-g)), the radial piston pump being equipped with a housing component (5) having an integrated retaining ring (51) for fastening all of the covers (23(a-g)) of the radial piston pump.

Description

Radial piston pump, in particular radial piston compressor

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

A radial piston pump is an element of fluid technology. In this pump, which can also be referred to as a pump based on the radial piston principle, the piston-working chamber combinations are arranged radially and perpendicularly to the drive shaft, in contrast to an axial piston compressor. The conveying or lifting movement of each individual working piston is caused by an eccentric located on the drive shaft. As a rule, the radial piston pump comprises a plurality of piston/working chamber combinations which extend in a star shape and radially from the drive shaft. The radial piston pump pumps a fluid from a low-pressure space into a high-pressure space.

Radial piston pumps are used, for example, as compressors for coolants in air conditioning systems in motor vehicles, in particular also in electrically driven motor vehicles. A radial piston pump can also be referred to as a radial piston compressor or refrigerant compressor based on the radial piston principle.

In this context, it is provided that a cover is arranged on the head side of the working space or closes it. The cover is exposed to the pressures prevailing in the working area and must be fixed accordingly.

According to the prior art, the cover is screwed on, for example. It is clear that the assembly work is not insignificant if all the covers of a radial piston pump with several piston-working chamber combinations have to be assembled accordingly.

In a patent application by the applicant, it is proposed here to use a common retaining ring to fix all the covers of the radial piston pump. In order to ensure a distance between the housing component and the retaining ring in the radial direction, the inner diameter of the housing component must be larger by the distance than the outer diameter of the retaining ring. This means that the radial installation space of the overall component is relatively large. Although a solution that is easy to assemble has already been proposed here, there is still a need for improvement, particularly with regard to the space required.

This is where the present invention comes in and sets itself the task of proposing an improved radial piston pump, in particular proposing a radial piston pump that is easy to assemble but also tends to require less space.

According to the invention, this object is achieved by a radial piston pump having the characterizing features of claim 1. Because the radial piston pump is equipped with a housing component with an integrated retaining ring for fixing all the covers of the radial piston pump, a very space-saving radial piston pump can be provided. In other words, in particular the function of the retaining ring for fixing the cover is integrated into a separate housing component. What is achieved by the invention is that only one component assumes the holding force of the cover and at the same time is part of the housing of the radial piston pump, which results in particular in a reduction in components and/or simplification of components. The advantage of this integration is, in particular, that the cover does not have to be screwed on, as a result of which, in particular, a saving in work steps and the elimination of components for fixing, for example screws, locking rings, etc., can be achieved. Furthermore, a reduction in the radial installation space of the overall assembly can be achieved. In particular, the housing screw connection can be placed further inwards, ie on a smaller pitch circle, and the outer diameter of the overall assembly can thus be reduced radially. It is possible to reduce the radial installation space with a retaining ring. The result is a smaller pressurized diameter, which results in a smaller area and, in turn, a lower required axial force. This allows smaller screw dimensions. Reducing the pressurized inner diameter results in a reduction in the pressure area and this then leads to a lower axial force. Less axial force pushing the body parts apart means less operating force on the body bolting. Less housing screwing also results from the fact that a smaller diameter means less axial force compared to a retaining ring. Advantageously, a lower load on the axial screw connection of the housing is also achieved, possibly associated with a reduction in costs, by using fewer screws or screws with lower strength or screws with a smaller diameter. In addition, the pressure-loaded surface within the axial sealing surfaces, in particular in the axial direction of the overall component, is smaller. An advantageous side effect of the invention is the reduction Total 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.

Further advantageous refinements of the proposed invention result in particular from the features of the dependent claims. The objects or features of the various claims can in principle be combined with one another as desired.

In an advantageous embodiment of the invention, it can be provided that the radial piston pump comprises at least three, preferably eight, piston-working chamber combinations, which are arranged in a star shape around the drive shaft. Accordingly, many piston-working chamber combinations can be combined in one compact radial piston pump.

In a further advantageous embodiment of the invention, it can be provided that the radial piston pump has at least one further housing component, in particular a braided 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. has, wherein the housing component with an integrated retaining ring and the further or further housing components form the housing of the radial piston pump. In principle, it is provided that the housing component with an integrated retaining ring and the other housing components form the housing of the radial piston pump. Accordingly, the housing components are completed to form an overall housing and a correspondingly compact radial piston pump.

In a further advantageous embodiment of the invention, it can be provided that the housing component with an integrated retaining ring has plane-parallel axial sealing surfaces. Sealing surfaces configured in this way can provide a tight connection to the adjacent housing component, such as the cylinder housing.

In a further advantageous embodiment of the invention, it can be provided that the surfaces of the sealing surfaces of the housing component with an integrated retaining ring are equipped with concentric grooves, in particular with a waviness in the radial direction. The sealing effect can be further improved by the concentric groove or grooves. In a further advantageous embodiment of the invention, it can be provided that contact surfaces are provided on the housing component with an integrated retaining ring and on the cover, the contact surfaces preferably being designed in such a way that the housing component with an integrated retaining ring can fix the cover on the cylinder housing.

In a further advantageous embodiment of the invention, it can be provided that the contact surface to and/or the respective cover is flat or concave/convex, with the curvature of the cover or the housing component with an integrated retaining ring preferably being axial to the shaft of the compressor and/or transverse can go to it. Such a configuration of the contact surfaces can ensure improved retention of the cover by the housing component with an integrated retaining ring.

In a further advantageous embodiment of the invention, it can be provided that the cover and/or the housing component with an integrated retaining ring has an overlap in the joining diameter, in particular in the area of the cover on the cylinder housing, so that a press fit is produced between the cover and the retaining ring integrated in the housing. The interference, also referred to as interference, can be used to create or maintain an interference fit by utilizing a degree of resilience from the housing component with integrated retaining ring. The joint diameter means the "common" diameter between the cover and the retaining ring, which ensures the function of the cover fixation with the design as an interference fit.

In a further advantageous embodiment of the invention it can be provided that a screw is provided for the connection of all housing parts. This allows all housing components to be screwed together quickly and easily, since they can be screwed together at the same time.

In a further advantageous embodiment of the invention it can be provided that the housing component with an integrated retaining ring consists at least in sections of steel or a steel alloy. With such a choice of material, the high strength requirements of its function as a retaining ring (surface pressure to the cover) can be achieved in an advantageous manner.

In a further advantageous embodiment of the invention, it can be provided that there is surface contact between the cover and the housing component with an integrated retaining ring is provided. An optimal power transmission and correspondingly little or less punctiform loading can be achieved through a surface contact.

In a further advantageous embodiment of the invention, it can be provided that the housing component with an integrated retaining ring and the cover have at least partially corresponding shapes. As a result, an optimal form fit between the housing component with integrated retaining ring and the cover or covers can be achieved. An optimized surface means, for example, better distribution of forces and/or less deformation of the cover.

In a further advantageous embodiment of the invention, it can be provided that the housing component with an integrated retaining ring has at least one passage for the housing screw connection, the passage for the housing screw connection being interrupted inwards or being designed as a fully enclosed passage. While the variant with the interrupted passage is characterized by a lower installation space requirement, a fully enclosed passage represents a good seal against the internal pressure.

In a further advantageous embodiment of the invention, it can be provided that at least one, preferably two, positioning means, in particular a positioning bore, are provided in the housing component with an integrated retaining ring. This can ensure that the housing component with an integrated retaining ring is always installed in a predetermined position. In addition, assembly is facilitated in that the angular position does not have to be determined for each assembly process.

The radial piston pump proposed here, in particular a radial piston compressor, can preferably be used as an air conditioning compressor, preferably with an electric motor as the drive. Accordingly, the fluid is preferably a refrigerant. Further features and advantages of the present invention become clear from the following description of preferred exemplary embodiments with reference to the attached figures. show in it

Fig. 1 shows a radial piston pump with a separate retaining ring in a cut

Opinion;

2 shows a radial piston pump according to the invention in a sectional view;

3 shows a radial piston pump with a separate retaining ring in a front view;

4 shows a radial piston pump according to the invention in a view from the front;

5 shows a radial piston pump according to the invention in a longitudinal section;

6 shows a radial piston pump according to the invention in a cross-sectional view;

7 shows a housing component of a radial piston pump according to the invention;

8 shows a housing component of a radial piston pump according to the invention;

9 shows a housing component of a radial piston pump according to the invention;

FIG. 10 shows an enlarged representation of a portion of a housing component according to FIG. 8;

11 shows a schematic representation of the fluid flow of an inventive

radial piston pump;

12 is a schematic representation of the fluid flow of an inventive

radial piston pump;

13 is a schematic representation of the fluid flow of an inventive

radial piston pump;

14 shows a radial piston pump according to the invention in a sectional view.

The following reference symbols are used in the figures:

L longitudinal axis

F Fluid

D area

Da_Gehl 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 Inside diameter of a radial piston pump with a 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 body

5 housing component with integrated retaining ring

6 stator housing

11 eccentric

21 workroom

22 pistons

23(a - g) cover

24 inlet valve

25 outlet valve

26 seal

27 screw

51 retaining ring

52 sealing surface

53 contact surface (on the housing component)

54 positioning means, in particular positioning bore

55 passage (for the housing screw connection)

231 contact surface (on the cover)

241 fluid inlet

251 fluid outlet

252 high pressure fluid channel

521 groove

Features and details that are described in connection with a method also apply in connection with the device according to the invention vice versa, so that with regard to the disclosure of the individual aspects of the invention, mutual reference is or can always be made. In addition, an optionally described method according to the invention can be carried out with the device according to the invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the terms "comprises" and/or "comprising" when used in this specification specify the presence, but not the presence, of the recited features, integers, steps, operations, elements and/or components or exclude the addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Reference is first made to FIGS. 2 and 4. FIG.

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 accommodated in a cylinder housing 4 . A longitudinal axis L of the drive shaft 1 is shown in FIG. 5 to define the axial direction. The piston-working chamber combination 2 essentially comprises a working chamber 21 and a piston 22. The working chamber 21 is closed with a cover 23 on the head side or on the piston head side.

As a rule, the radial piston pump comprises at least two piston-working chamber combinations 2, 2a, 2b, ..., which extend radially from the drive shaft 1. The radial piston pump preferably comprises at least three, preferably six, piston/working chamber combinations 2, 2a, 2b, . Correspondingly, 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 accommodated in the cylinder housing 4.

Furthermore, a fluid inlet 241 is provided in the cover 23 or on the head side of the working space 21 . Also in the working space 21, preferably in the wall of the working space 21, a fluid outlet 251 is provided. The fluid inlet 241 is equipped with an inlet valve 24 which can selectively close or release the fluid inlet 241 . The fluid outlet 251 is equipped with an outlet valve 25 which can selectively close or release the fluid outlet 251 . Alternatively it can also be provided that the fluid inlet 241 or the inlet valve 24 is provided in the piston 22, in particular the piston crown. Reference can be made here to FIG. 10, for example.

The fluid F to be compressed flows via the fluid inlet 241 or the inlet valve 24 into the working chamber 21, is compressed there by the fluid movement of the piston 22 and leaves the working chamber 21 through the outlet valve 25 or the fluid outlet 251. Here, for example, reference can be made to Figs 11 and 12 for schematic indication of the flow path. The configuration of the valves, for example as a sheet metal spring valve, is sufficiently well known to the person skilled in the art and does not require any further explanation here.

According to the invention, the radial piston pump is equipped 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, .

To clarify the difference from a separate retaining ring, reference is made to FIGS. 1 and 3, which show a separate retaining ring for all the covers of the piston-working chamber combinations. A comparison of the above illustrations, FIGS. 1 and 3 on the one hand and FIGS. 2 and 4 on the other hand, shows the effect on the outer diameter of the overall assembly. It is clear that in the embodiment according to the invention with a retaining ring integrated in the housing, see in particular Figures 2 and 4, the outer diameter Da_Geh2 is smaller than in the variant with a separate retaining ring and its outer diameter Da_Gehl, see in particular Figures 1 and 3.

There are also advantages with regard to the inner diameter of the radial piston pump according to the invention. Thus, FIGS. 3 and 4 show the inside diameters of the housings of both variants, on which a low pressure p_ND (cf. in particular FIG. 5) acts. It can be seen that both the outer and the inner housing diameter of the variant "housing-integrated retaining ring" Di_Geh 2 is smaller than the diameter Di_Geh 1 of the variant "separate retaining ring". The larger inner diameter of the "separate retaining ring" variant means that the axial force (at the same pressure) is greater. Greater axial force means greater stress on the body bolting, specifically higher operating force on the bolts. As a measure to maintain the sealing effect, in particular axially between the housing parts, the prestressing force of the screws would have to be increased, a screw material with higher strength would have to be used and/or the number of screws would have to be increased. All of these measures would lead to an increase in costs. The solution according to the invention of the housing component with an integrated retaining ring offers advantages here, since smaller inner surfaces are to be expected or possible and correspondingly lower forces are to be expected.

The housing components of the radial piston pump are shown in particular in FIG. It is preferably provided that the radial piston pump has at least one further housing component, the housing component 5 with the integrated retaining ring 51 and the further or further housing components forming the housing of the radial piston pump. The radial piston pump shown here by way of example consists on the housing side preferably of a total of four housing components which are screwed together in particular axially. A radial piston pump according to the invention comprises, for example, a high-pressure housing 3, the cylinder housing 4, in particular for accommodating the piston-working chamber combinations (2, 2a, 2b, ...), the housing component 5 with an integrated retaining ring 51, and a stator housing 6, in particular for accommodating 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 to one another, is preferably set up to ensure the sealing effect with respect to the environment between the housing components, cf. in particular Fig. 5.

The housing component 5 with an integrated retaining ring preferably has plane-parallel axial sealing surfaces 52 in order to be able to ensure the tightness requirements for the adjacent housing parts. Preferably, the surfaces of the sealing faces 52, at least in area D, are equipped with concentric grooves 521, in particular with a waviness in the radial direction. The grooves 521 are preferably designed in the micrometer range, in particular in the sealing area to the outside. Reference can be made in particular to FIG. 10 here.

In a further advantageous embodiment of the invention, it can be provided that the housing components 3, 4, 5, 6 are screwed together to form the pump housing. The housing components are preferably screwed together using a screw 27 . For this purpose it can be provided that the cylinder housing 4 has a flange 28 or the like. Has, which is used for screwing with the other housing components.

The cylinder housing can also have a sealing surface 52 .

Fluid channels of the radial piston pump, or at least partial areas of fluid channels, can preferably be formed by means of the housing parts that are screwed together. Such a composite channel is, for example, the braid pressure channel 252.

The housing components 3 to 6 can delimit or seal different pressure areas within the radial piston pump or to the outside. In a further advantageous embodiment of the invention, it can be provided that the housing component has plane-parallel axial sealing surfaces. Sealing surfaces configured in this way can provide a tight connection to the adjacent housing component, such as the braided pressure housing 7 or the stator housing 8 .

Furthermore, it can be provided that seals are arranged additionally or solely between the sealing surfaces 52 .

In a further advantageous embodiment of the invention, it can be provided that the surfaces of the sealing surfaces 52 have one or more geometric shapes that deviate from a flat or approximately flat surface. Provision can thus be made for at least one of the sealing surfaces 52 to have a concave or convex shape for the purposeful formation of contact surfaces or line contacts. For example, a flat sealing surface 52 of a housing component can be brought into contact with the convex surface or sealing surface 52 of another housing component and thus be sealed. By contacting a planar and a convex surface, a defined line contact is advantageously formed between the two surfaces. Such a line contact can preferably fully or at least partially represent the function of a seal between corresponding components. One of the surfaces can advantageously exhibit elastic behavior, so that fluctuations in the distance between the components can be compensated for by the elasticity.

Preferably, contact surfaces 53 are provided on the housing component 5 with an integrated retaining ring 51 and contact surfaces 231 on the cover 23, wherein the contact surfaces are preferably formed such that the housing component 5 with an integrated retaining ring 51 the Cap 23 can be fixed to the cylinder housing 4, in particular axially and/or radially, i.e. against pressure from the working chamber 21.

More preferably, the cover 23 and the housing component 5 with the integrated retaining ring 51 overlap in the joining diameter, particularly in the area of the cover 23 on the cylinder housing 4, so that there is a press fit between the cover 23 and the retaining ring 51 integrated in the housing.

One screw is preferably provided for connecting all the housing parts, in other words the housing parts are connected with a single screw, as shown in FIG. 14 as a detail of a longitudinal section of a radial piston pump according to the invention. Fast assembly is possible when all housing components are screwed together using one screw, as there are no screw connections between them.

For example, the cylinder housing 4 and the housing-integrated retaining ring 5 can advantageously form a preassembled assembly or a module for assembly. The housing part 5 with the housing-integrated retaining ring 51 directly fixes all the covers 23 on the cylinder housing 4. The housing parts or the preassembled modules can be aligned with one another and then screwed together with at least one screw 27. Another advantage that results from using the housing component 5 as a separate component is the ability to pre-assemble (without screws) the housing component 5 and the cylinder housing 4 (preferably with the cover 23 and the valves 24, 25, pistons and, if necessary, seals) comprehensive assembly. This assembly can then be easily screwed to the other housing components and the radial piston pump can be fully assembled. Another advantage is the resulting modularity. The housing components or the housing of the radial piston pump can be produced, for example, by means of an injection molding or die-casting process. If you now want a radial piston pump with a different cylinder layout, eg a different cylinder volume or a different arrangement/number of cylinders, the installation space requirement in the axial direction of the radial piston pump also usually changes. The individually adapted housing component 5 can be used, for example, to react to a changing axial installation space requirement of a cylinder housing 4 that has been modified in this way. As long as the contact surfaces or the sealing surfaces are unchanged, the other housing components can be used without any changes. Thus, by means of the housing component 5 with an integrated retaining ring 51, a radial piston pump that is modular and/or scalable in terms of its axial overall length (or capacity) can be formed. the Housing component 5 can also be understood as a housing ring or spacer. Details on this are shown in particular in FIG.

The housing component 5 with the integrated retaining ring 51 should preferably be joined at an angle to the cylinder housing 4 with regard to the angular position, so that the passages for the housing screw connection(s) are aligned with one another and the screws can be pushed through or the contact surfaces 231 or 53 from the cover 23 to the retaining ring 51 correspond. For this purpose it can be provided, for example, that the housing component 5 is equipped with an integrated retaining ring 51 and at least one positioning means, in particular a positioning bore. The cylinder housing 4 accordingly has a corresponding positioning means, for example in the form of a pin. The positioning means 54 of the housing component 5 is used in particular for the angular orientation of the integrated retaining ring 51 in relation to the joining device. The cylinder housing should be fixed at an angle in the assembly nest, for example on the mounting slugs or a different geometry. The automated assembly can then join the two housing parts in the correct angular position. Due to the assignment of the contact surfaces between the cover 23 and the integrated retaining ring 51, angular orientation is advisable.

In this way it can be ensured, for example, that during assembly the housing component 5 with the integrated retaining ring 51 can be joined in the correct angular position, for example for receiving in the gripper of the tool. It can also advantageously be provided that the housing component 5 with an integrated retaining ring 51 is equipped with a second positioning means, in particular a second positioning bore 54 . A second positioning hole, in particular with an angular offset other than 180° to the first positioning hole, is particularly advantageous if, for example, there is a chamfer or rounding on the inner ring edge on one side of the retaining ring 51, which facilitates the joining of the retaining ring 51. The second, offset positioning bore always ensures that the housing component 5 with the integrated retaining ring 51 is installed at the correct angle.

The second positioning hole can be on a different hole circle than the first hole, with the advantage of safe angular alignment, with the advantage that the housing component 5 cannot be installed the wrong way around (rotated 180° around the vertical axis) if one side to the Add a chamfer to it is provided. In a further embodiment, 3 bores are provided, with one being arranged on a different radius or pitch circle. As mentioned above, the advantage is the clearly angle-oriented side assignment that is correct for the housing component.

Provision can also preferably be made for the cover 23 to have the inlet valve(s) 24 .

Housing component 5 with integrated retaining ring 51 should preferably be made of steel or a steel alloy, at least in sections, but at least retaining ring 51 as such, so that it advantageously meets the high strength requirements of its function as a retaining ring (surface pressure on the cover).

All materials and manufacturing processes known from the prior art, such as casting, turning or milling (coarse and fine), can be used as the material and/or manufacturing process for the housing component 5 with the integrated retaining ring 51 .

Provision can also preferably be made for the contact surface of the cover and/or the associated contact surface of the housing component with an integrated retaining ring to be flat or concave/convex, with the curvature of the cover or the housing component with an integrated retaining ring being axial to the shaft of the compressor and/or can go right to it.

Furthermore, it can preferably be provided that there is surface contact between the cover and the housing component with an integrated retaining ring.

Provision can also preferably be made for tolerances to be compensated for between the cover and the housing component with an integrated retaining ring.

Provision can furthermore preferably be made for the housing component with an integrated retaining ring and the cover to have shapes which correspond at least in part to one another.

Possible configurations of the housing component with an integrated retaining ring, in particular its passages for the housing screw connection, are shown in particular in FIGS. 7 to 9.

For example, a variant is shown in FIG. 7 in which the passage 55 for the housing screw connection is interrupted inwards. The location of the passages is inside of the ring next to the area of the lid system. The housing component 5 with an integrated retaining ring 55 preferably has two plane-parallel axial contact surfaces which represent the sealing surface for the adjacent housing parts. The arrows show examples of the contact points for attachment to the cover. Eight contact points are provided here, so that eight covers can be fixed with the housing component shown here with an integrated retaining ring. The variant outlined here is characterized in particular by a lower installation space requirement, in particular by the lack of enclosing of the screw passages / bores.

8 shows a housing component with an integrated retaining ring with a stress-optimized interruption for the passages for the screw connection. For illustrative purposes, arrows point to possible contact points for contact with the cover. The variant outlined here is characterized in particular by a lower installation space requirement, in particular by the lack of enclosing of the passages.

9 shows a housing component 5 with an integrated retaining ring 51 with fully enclosed passages for the screw connection. For illustrative purposes, arrows show examples of possible contact points for contact with the cover 23. The variant outlined here is characterized in particular by the fact that no pressure spreads between the screw and the screw hole. This means that the screw hole is already sealed off from the refrigerant inside the compressor. An additional seal, e.g. under the screw head, is generally not required.

In particular, Figure 14 shows the simultaneous screwing of all housing components 3-6. FIG. 14 is part of a longitudinal section through the radial piston pump, the section being laid out in such a way (course indicated in FIG. 6) that the screw connection/the screw is shown. As a result, the cover 23 and the required inlet valve are not shown. It is clear that the screw must not cover the inlet opening. As can be seen from the figures, the screw connection is preferably provided next to the contact surfaces between the housing component 5 and the 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 the function of the housing component 5 is integrated into the stator housing. The housing component 5 can be viewed as a type of housing disc. The contact surfaces can be machined over the entire length of the housing washer. If the stator housing 6, the functions of housing component 5 and thus the Contact surfaces 53 are formed to cover 23, the processing is more complex and therefore expensive.

Claims

Expectations

1. Radial piston pump, in particular radial piston compressor, comprising

- A drive shaft (1) with an eccentric (11), and at least one piston-working space combination (2), wherein the piston-working space combination (2) comprises a working space (21) and a piston (22), wherein

- the radial piston pump has at least two piston-working chamber combinations (2, 2a, 2b,

. . .) which extend radially from the drive shaft (1), each working chamber (21) being closed with a cover (23 (a-g)), characterized in that the radial piston pump is provided with a housing component (5) with an integrated retaining ring (51 ) to the

Fixation of all covers (23 (a-g)) of the radial piston pump is equipped.

2. Radial piston pump according to 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. Radial piston pump according to at least one of the preceding claims, characterized in that the radial piston pump has at least one further housing component, in particular a high-pressure housing (3), a cylinder housing (4), in particular for accommodating the piston-working chamber combinations (2, 2a, 2b, ...), and/or a stator housing (6), in particular for accommodating a rotor of an electric motor, the housing component (5) with an integrated retaining ring (51) and the further or further housing components forming the housing of the radial piston pump.

4. Radial piston pump according to 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 surfaces (52).

5. Radial piston pump according to at least one of the preceding claims, characterized in that the surfaces of the sealing surfaces (52) of the housing component (5). integrated retaining ring (51) with concentric grooves (521), in particular with a waviness in the radial direction. Radial piston pump according to at least one of the preceding claims, characterized in that contact surfaces (53) are provided on the housing component (5) with an integrated retaining ring (51) and on the cover (23), the contact surfaces (53) preferably being designed in such a way that the Housing component (5) with integrated retaining ring (51) can fix the cover on the cylinder housing. Radial piston pump according to at least one of the preceding claims, characterized in that the contact surface (53) to and/or the respective cover (23) is flat or concave/convex, with the curvature of the cover (23) or the housing component (5) also integrated retaining ring (51) can preferably run axially to the drive shaft (1) of the radial piston pump and/or transversely thereto. Radial piston pump according to at least one of the preceding claims, characterized in that the cover (23) and/or the housing component (5) with an integrated retaining ring (51) has an overlap in the joint diameter, in particular in the area of the cover (23) on the cylinder housing (4). has, so that there is a press fit between the cover (23) and the housing component (5) with an integrated retaining ring (51). Radial piston pump according to at least one of the preceding claims, characterized in that a screw is provided for connecting all the housing parts. Radial piston pump according to at least one of the preceding claims, characterized in that the housing component (5) with an integrated retaining ring (51) consists at least in sections of steel or a steel alloy. Radial piston pump according to at least one of the preceding claims, characterized in that there is surface contact between the cover (23) and the housing component (5) with an integrated retaining ring (51). Radial piston pump according to at least one of the preceding claims, characterized in that the housing component (5) with an integrated retaining ring (51) and the cover (23) have at least partially mutually corresponding shapes. Radial piston pump according to at least one of the preceding claims, characterized in that the housing component ( 5) with integrated retaining ring (51) has at least one passage (55) for the housing screw connection, the passage (55) for the housing screw connection being interrupted inwards or being designed as a fully enclosed passage for the screw connection. Radial piston pump according to at least one of the preceding claims, characterized in that at least one, preferably two, positioning means, in particular positioning bore (54), are provided in the housing component (5) with an integrated retaining ring (51).