CN106917873B

CN106917873B - Housing component with hydraulic circuit

Info

Publication number: CN106917873B
Application number: CN201611273136.5A
Authority: CN
Inventors: S·布勒德纳; A·京德; J·L·比罗德
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2015-12-23
Filing date: 2016-12-22
Publication date: 2021-09-03
Anticipated expiration: 2036-12-22
Also published as: CN106917873A; DE102015226610A1

Abstract

A housing component (12) is proposed, which has a line section (1) of a hydraulic line (2) with at least one channel (3) which opens into an extension (13) which extends up to an outer side (14) of the housing component (12) and on which extension (13) a sealing surface (4) is provided which surrounds and spatially delimits the channel (3), wherein the extension (13) is provided in an adjacent region on the outer side (14) with at least one lip (16).

Description

Housing component with hydraulic circuit

Technical Field

The invention relates to a housing component having a line section of a hydraulic line (which has at least one channel) and a sealing surface which surrounds and spatially delimits the channel. The invention is particularly applicable in hydraulic blocks used for conveying fluids, in particular oil, under high pressure.

The invention is particularly applicable in hydraulic blocks used for conveying fluids, in particular oil, under high pressure. The invention is used in particular in valve housing blocks or valves, which hitherto have a housing made of a metallic cast material. The valve is usually screwed to the control block and is connected at the coupling surface to a hydraulic line formed in the control block. The fluid channel then merges into the coupling surface of the valve. These junctions are surrounded by an annular groove into which an elastic sealing ring is inserted.

Background

It is known to date that hydraulic blocks are made of solid material. The flow channels and the passages (Passung) are produced here, for example, by means of drilling and/or grinding. It is also problematic in the production of such sealing surfaces, which generally require additional machining. Such a production of the hydraulic block or the housing component with the line sections of the hydraulic lines is technically complicated and thus also time-and cost-intensive. In the case of the production method for producing such components, problems may arise in the tightness and/or assembly of the components to be joined if their production tolerances are too great for the application described here.

In operation, it also occurs that if a blocking pressure (leakage) builds up on the outside of the seal, the seal presses or slides into the channel. It has also been determined that the seal can be subjected to strong alternating stresses due to unstable or dynamic pressure loading from the inside, which leads to repeated deformations of the seal during operation, which can lead to damage to the seal and a reduction in the service life. It is particularly important here that the seal is not pressed into a gap, which may be formed radially on the outside, between the components during operation.

Disclosure of Invention

It is an object of the present invention to at least partially alleviate the problems reflected with reference to the prior art. In particular, a housing component should be specified which allows greater variability and/or more precise production. Furthermore, the manufacturing method should be simplified if possible, or the risk of leakage should be reduced in high-pressure applications.

A housing component contributes to these objects, which has a line section of a hydraulic line with at least one channel which opens into an extension which extends as far as the outside of the housing component and on which a sealing surface is provided which surrounds and spatially delimits the channel. The extension is embodied with at least one lip on the outside in the adjacent region.

The (preferably metallic) housing component is in particular a so-called valve block or a so-called control block for a valve device of a hydraulic device. The housing member internally comprises a (single) hydraulic circuit or a plurality of hydraulic circuits. In particular, a line section of the hydraulic line is observed, which line section comprises a channel which opens out to the outside of the housing component. In particular, a sealing surface is provided in this region around the channel. The sealing surface is arranged around the channel, in particular on the inner bottom of an extension which is based on the outer side of the housing component.

The at least one lip is adjacent to a transition region between the expansion and the outer side. Very particularly preferably, the at least one lip is formed adjacent to the extension at the outer side within a maximum of 5mm [ mm ], wherein preferably the lip which is located radially to the greatest extent inside is formed directly adjoining the extension or is formed directly adjoining the edge of the extension and in particular transitions into a radius leading into the extension. A construction solution with one single lip, two lips, three lips or four lips is preferred. The at least one lip is in particular embodied in one piece with the housing component. The at least one lip is formed in particular by: i.e. it can be plastically deformed (relative to the rest of the housing member) with a significantly smaller force. The term "lip" is to be understood in particular as follows: i.e. a thin-walled cross section is present which, in particular from the outside, has a greater (axial) height than the (radial) width. The at least one lip is preferably arranged circumferentially around the extension.

Preferably, the housing component is formed in a layered manner at least in the region of the at least one lip. In particular, this means that at least this region has an internal material structure which is produced by means of a "generative" or "adaptive" production method. Preferred manufacturing methods are also set forth below. Very particularly preferably, the at least one lip is formed in layers such that: as is directly evident from the "generative" or "adaptive" production method, in particular, no additional machining of the sealing surfaces by cutting is necessary. Such a layered structure of the housing component, the line section, the hydraulic line, the channel, the sealing surface, the extension and/or the at least one lip is technically easy to produce and can likewise be easily identified on the component.

An advantageous embodiment relates to the preparation of a single lip, which like the housing member is constructed from a metallic material. When the associated component is assembled, the metallic lips can then be (plastically) deformed and thus compensate for possible differences in the flatness of the two components. Such a construction solution with a single lip is provided in particular if a single fitting of a specifically assigned component is provided.

In particular when multiple assembly and disassembly is required, it is advantageously proposed that the housing component is provided with at least two lips which are positioned concentrically around the extension.

Very particularly preferred in this context is that the at least two lips partially coincide with one another in the axial direction.

Preferably, the at least one lip, in particular the plurality of lips, runs obliquely to the outside.

If a plurality of lips (for example two concentric lips) are provided, they may also be inclined oppositely. In this way, for example, two adjacent lips can be brought into register.

In particular, in the case of two concentric lips, a multiple assembly is possible, which, due to the design which is configured obliquely opposite to one another with respect to the outer surface, can partially overlap one another in the axial direction. One lip serves, for example, as an abutment surface for the coupling assembly, while the other lip is positioned at least partially between the first lip and the outside of the housing component and acts in the manner of a return spring. The lip arrangements are therefore optionally relaxed again during disassembly and allow mutual realignment of the lips or sealing surfaces during the reinstallation of the coupling assembly.

It is also advantageous if the at least one lip has a height and a width in cross section, wherein the height is greater than the width by at least a factor of 3. Very particularly preferably, this factor lies in the range from 6 to 10. The invention is based on the provision of steel, in particular chromium-nickel steel, as the material of the lip. Very particularly preferably, the height amounts to at most 5mm [ mm ], while the width amounts to at most 0.8mm [ mm ]. The height is in particular at least 0.5mm or at least 2.5 mm. The width is in particular at least 0.1mm or at least 0.4 mm.

The at least one lip is preferably arranged around the extension on an annular flange. This means in particular that an annularly extending flange of material (one-piece) construction with the housing component is provided in the circumferential direction below the lip, and that the outer side is also seated axially outside this flange in the radial direction. A spatially limited, stable seat surface for mounting or dismounting is thus formed by the annular collar. This achieves a well-defined abutment of the coupling assembly or an orientation of the coupling assembly relative to the housing component. Radially outside, adjacent to the annular flange, it is also possible to form a discharge end for hydraulic fluid which may occur or which may flow in from other regions, thus avoiding (re-) intrusion into the expansion. The annular flange preferably has a radial extension of 3 to 8 mm.

The shell component proposed here is preferably produced by means of a method according to the following steps:

a. a layer of loose material is provided on the foundation,

b. the layer is connected to a solid body by means of high-energy radiation, which follows a predetermined path along the layer.

c. Repeating the steps a and b.

d. Wherein at least the outer side is shaped with the at least one lip.

In the methods proposed here, so-called "rapid prototyping" or "production" methods are used in particular for producing solids. This is to be understood in particular as "solid free form fabrication methods", which relate to methods for fabricating components directly from computer data, such as in particular the so-called electron beam melting, stereolithography, selective laser sintering, etc.

Very particularly preferably, the method is implemented as Selective Laser Melting (SLM). The SLM method is a "rapid prototyping" method that is used exclusively for the manufacture of metals. As in 3D printing, the components are built in a layered approach (also referred to as "additive manufacturing"). The component is produced by melting with the laser radiation. Unlike in Selective Laser Sintering (SLS), in Selective Laser Melting (SLM), the material powder is not sintered. In the SLM method, the material powder is locally melted directly at the processing point by the thermal energy of the laser radiation. The powder material can be heated up to approximately the melting temperature, wherein this can take place under a protective gas, whereby the material does not oxidize.

To this end, first, according to step a, a layer of loose material is provided on the foundation. The layer height can be set in a demand-oriented manner, wherein the layer height is preferably in the range of 0.01 to 0.05mm [ mm ]. Such powders are particularly suitable as "bulk materials", very particularly preferably metallic powders. Very particularly preferably, especially in view of the preferred field of hydraulic application, powders of metals of the following types are employed:

-material: Cr-Ni-Steel (e.g. material number 1.2709/X3NiCoMoTil8-9-5)

-powder size: 0.01 to 0.05mm [ mm ].

Even if the bulk material can in principle be provided under or in a fluid, the provision is preferably made in the prevailing ambient conditions (atmosphere).

According to step b, at least one part of the bulk material or a predetermined region of the layer is connected to a solid body by means of high-energy radiation. High-energy radiation is used in particular for this: at least partially melting the bulk material and entering a permanent connection with an adjacent material component. This relates on the one hand to the material of the uppermost cover layer and, if appropriate, to the material of the (sub) layers lying therebelow, as long as the layers a and b have been implemented at least once. Generally, laser radiation or electron radiation is employed as the high-energy radiation. The high-energy radiation is guided through or on the (cover) layer along a predetermined (computer-controlled or regulated) path during the connection. The path can be uninterrupted, but it is of course also possible to take a separate path with high-energy radiation in different regions of the layer.

In order to build the desired component, including the line section, these steps a and b are repeated corresponding to the dimensions of the component. In this way, the layers are supplemented one on top of the other and are reworked by means of high-energy radiation. This repetition of steps a and b is especially performed so frequently: until the sealing face (outside the solid) is also finished.

In this case, it is often necessary to produce and cure a plurality of layers in order to build up the lips in accordance with step d.

It is therefore particularly preferred to produce the lip or the lips (optionally together with the annular flange) by means of this generative production method. This allows, in a simple manner, for example also the arrangement of lips which have an overlapping and/or oppositely inclined orientation.

Furthermore, a device is proposed which has a housing component in the embodiment proposed here, a coupling assembly and an annular seal, the latter being positioned in the extension and being pressed against the sealing surface by means of the coupling assembly. In this connection, it is described how an assembled state, for example, a hydraulic line, can be connected to such a housing component in a leak-proof manner.

According to another aspect, a method for assembling a device of the above-mentioned type is proposed, which comprises at least the following processes:

i. providing a shell member of the type suggested herein;

a predetermined distance in the axial direction from the sealing surface;

deforming at least one lip such that the lip extends all the way to the gap;

inserting an annular seal into the extension;

v. disposing a coupling assembly on the housing member with contact up to the annular seal and the at least one lip.

The production method proposed here can be carried out, for example, within the scope of process i. In this case, it can be provided in particular that the orientation or shaping of the manufactured lips is effected in an interference manner, i.e. starting from the sealing surface (or the outer side) in the axial direction beyond a desired distance. The component-specific distance can be determined as desired or predetermined according to the process ii. The lip is now initially (plastically) deformed in process iii as such: so that it extends as precisely as possible (by means of its axially outer end) to the distance and can therefore be adjusted very precisely, independently of the production method. After the presetting of the orientation or position of the at least one lip, the annular seal can also be inserted into the extension with the aid of the lips, in particular with the desired pretensioning, without the risk of major damage. In process v, the coupling assembly is then mounted on the housing component with a specific spacing, so that, in particular with a specific spacing of the faces to be sealed relative to one another, a precisely defined contact is produced directly to the annular seal.

It is particularly preferred to use a housing component and/or a device as explained above for conveying hydraulic fluid at high pressure. Such a housing component can also be referred to as a hydraulic block. Further (individual) line sections, valves, etc. can be connected to or in the housing component, wherein the seal between the housing component and the adjoining element is realized by a sealing element bearing against a sealing surface. The preferred application of the housing component or the requirements for the sealing surface can be demonstrated by means of the following features:

hydraulic fluid: the oil is selected from the group consisting of oil,

maximum working pressure: from 50 to 400bar (static or dynamic),

maximum volume flow: up to 100l/min (liters per minute),

working temperature range: -30 to +80 ℃ of,

viscosity range: 2.8-500mm²S [ square millimeter per second ]]。

The shell member is preferably made of metal, preferably with a material of 1000N/mm at 600-²[ Newton per square millimeter]A tensile strength in the range of (a).

Drawings

The present invention and the technical field are explained in more detail below. It should be noted that the same components in different drawings are always denoted by the same reference numerals. The figures are schematic and are not particularly intended to show the magnitude relationship. The figure is as follows:

FIG. 1: a magnetically actuable shuttle valve of the hydraulic component,

FIG. 2: schematic illustration of a method for producing a line section of a hydraulic line,

FIG. 3: a first embodiment variant of the sealing surface produced with the proposed method,

FIG. 4: a first embodiment variant of a housing member having a single lip;

FIG. 5: an embodiment variant of a housing member with two lips; and

FIG. 6: an illustration of the assembly method of a device having such a case member is provided.

Detailed Description

Fig. 1 shows, for example, a magnetically actuable directional slide valve for a plurality of further components which can have line sections of a hydraulic circuit. The slide valve is provided with a housing component 12 which is formed from a solid body 8 produced according to the method proposed here. A (optionally branched) hydraulic line 2 is formed in the housing component 12. The hydraulic circuit 2 shown here protrudes from the solid body 8 in two positions in the housing component 12. There, each line section 1 is formed, which has a channel 3 and a spatially limited sealing surface 4 surrounding the channel 3.

For the sake of illustration, the mode of operation of the magnetically actuable slide valve should be indicated briefly. Laterally of the housing component 12, two magnets 28 are provided, by means of which a control slide 29 arranged centrally in the housing component 12 can be moved. The control slide 29 is movable on both sides via a tappet 31 which can be moved by the magnet 28 and is prestressed against a return spring 30. In the unactuated state, the control slide 29 is held in the middle position or the desired initial position by the return spring 30. The actuation of the control slide 29 takes place via a specifically controllable magnet 28. The force generated by the magnet 28 acts via the tappet 31 on the control slide 29 and displaces it from its rest position into the desired end position. The required volume flow direction can therefore be free as desired. After the deactivation of the magnet 28, the control slide 29 is pushed back into its rest position by the return spring 30.

Since the coupling elements with which the hydraulic fluid (in particular oil) under high pressure is further conveyed are provided in the region of the two line sections 1, it is necessary to provide a permanent seal of the hydraulic line 2 with respect to these components.

Fig. 2 schematically shows a device for carrying out the method for producing a line section of the type proposed here. For this purpose, the container 24 is embodied with a foundation 7 (vertically) movable by means of a displacement device 25. On this foundation 7, a layer 5 of loose material 6 can be laid by means of a filling device 22. If a predetermined layer height is reached, the high-energy radiation 9 (which is generated in the radiation generator 23 and is optionally deflected by means of the optical device 26) is directed straight toward the bulk material. The high-energy radiation 9 sweeps along the layer 5 through a predetermined path 10, in which the bulk material 6 is at least partially melted and sintered to adjacent materials. In this way, the layer 5 then continuously produces the desired solid 8 layer by layer for the layer 5. The individual processes or the devices of the apparatus can be controlled by means of the control unit 21 and the data lines 27 adapted thereto in order to achieve the desired component geometry. In particular, the control unit 21, on account of the CAD data provided for it, specifies the movement of the filling device 22, of the high-energy radiation 9 (for example via the optical device 26) and of the foundation 7.

Fig. 3 shows the detail of the solid body 8 in a top view, wherein the detail is shown here in particular with respect to the channel 3 with the sealing surface 4. The solid body 8 has been built up layer by layer (layers 5 are indicated) by means of the method according to fig. 2, wherein the channel 3 and also the (substantially cylindrical) expansion 13 connected thereto have been formed. The extension 13 extends from the annular flange 16 or the outer side 14 in the axial direction 20 to a certain depth and has a predetermined diameter 37. The housing component formed by means of the solid body 8 is part of a device 33 which also comprises a coupling assembly 34 and an annular seal 35, wherein the annular seal 35 rests in the region of the sealing surface 4 and is pressed against the sealing surface 4 by means of the coupling assembly 34. At the same time, the coupling assembly 34 also bears by definition against the outer side 14 of the housing component 12 (in abutment with the channel 3 in the radial direction 15), so that a specifically set sealing effect is achieved.

Fig. 4 shows a variant embodiment of the shell component in the region of the expansion 13 in perspective and in partial cross section. It can be seen here that the channel 3 opens out into an extension 13, wherein the extension 13 extends as far as the outer side 14 of the housing component. The sealing surface 4 is arranged around the channel 3 and is spatially defined by means of a boundary 11 (radially). The sealing surface is designed flat in this exemplary embodiment, but this is not absolutely necessary. In the adjacent region of the extension 13, i.e. in particular outside in the radial direction 15 with respect to the extension 13, a (single) lip 16 is provided here. The lip extends (axially) outwards from the outer side 14, wherein it slopes outwards, in particular in the radial direction 15. In this case, the individual lips 16 are arranged on the annular flange 32.

Fig. 5 shows a further embodiment, in which two lips 16 are provided here, which are arranged concentrically around the extension 13. The two lips 16 coincide with each other in the axial direction 20 by: two of which are inclined to each other at an angle 38 in correspondence with each other. The lip 16 located radially outside (on the right) is therefore arranged partially below the lip 16 located radially inside (on the left) in the radial direction 15.

Figure 6 shows how the lip 16 can be used to assemble a device of the type described herein. The lip 16 has a predetermined height 18 and a predetermined width 19 in the cross-section 17. In the left-hand region, it is shown (see process iii) that the lip 16 is first of all pre-deformed in a setting step, i.e. in such a way that: i.e. the plate 39 acts on the lip 16 in such a way as to (plastically) bend it or to deform it to such an extent: until a predetermined distance 36 is set up towards the sealing surface 4 (or similar to the outer side 14). The distance 36 is selected in particular such that: a predefined pressure or contact is thus achieved up to the annular seal 35, which is indicated here in the right-hand part of the drawing, as is likewise the case with a flat or planar contact surface between the lip 16 and the plate 39. With this preset spacing 36, it is in fact possible to construct a coupling assembly instead of the plate 39.

Reference sheet

1 line segment

2 hydraulic circuit

3 channel

4 sealing surface

5 layers of

6 Material

7 foundation

8 solid

9 high energy radiation

10 route

11 boundary

12 shell component

13 expansion part

14 outside

15 radial direction

16 lips

17 cross section

18 height

19 width (L)

20 axial direction

21 control unit

22 filling device

23 radiation generator

24 container

25 moving device

26 optical device

27 data line

28 magnet

29 control slide

30 return spring

31 tappet

32 annular flange

33 device

34 coupling assembly

35 annular seal

36 space apart

37 diameter

38 degree angle

39 plate

Claims

1. A housing component (12) has a line section (1) of a hydraulic line (2) with at least one channel (3) which opens into an extension (13) which extends up to the outside (14) of the housing component (12) and in which extension (13) a sealing surface (4) is provided which surrounds and spatially delimits the channel (3), wherein the extension (13) is provided in the adjacent region at the outside (14) with at least one lip (16).

2. The housing component (12) as claimed in claim 1, wherein the housing component (12) is formed in a layered manner at least in the region of the at least one lip (16).

3. A housing member (12) according to claim 1 or 2, wherein at least two lips (16) are arranged concentrically around the extension (13).

4. The housing component (12) according to claim 3, wherein the at least two lips (16) partially overlap each other in the axial direction (20).

5. The housing component (12) as set forth in claim 1 wherein said at least one lip (16) extends obliquely toward said outer side (14).

6. The housing member (12) of claim 1 wherein said at least one lip (16) has a height (18) and a width (19) in cross-section (17), wherein said height (18) is at least three times said width (19).

7. The housing member (12) of claim 1 wherein said at least one lip (16) is configured around said extension (13) at an annular flange (32).

8. A method for manufacturing a shell component (12) according to any one of the preceding claims 1-7, having at least the following steps:

a. providing a layer (5) of loose material (6) on a foundation (7),

b. connecting the layer (5) to a solid body (8) by means of high-energy radiation (9) which follows a predetermined path (10) along the layer (5),

c. the steps a and b are repeated, and,

d. wherein at least the outer side (14) is shaped with the at least one lip (16).

9. A device (33) comprising a housing member (12) according to any one of the preceding claims 1-7, a coupling assembly (34) and an annular seal (35), the latter being positioned in the extension (13) and being pressed against the sealing surface (4) by means of the coupling assembly (34).

10. A method for assembling a device (33) according to claim 9, the method comprising at least the following steps:

i. providing a shell member (12) according to any one of the preceding claims 1-7;

-a predetermined distance (36) in the axial direction (20) from the sealing surface (4);

deforming at least one lip (16) such that the lip extends all the way to the gap (36);

placing an annular seal (35) into the expanded portion (13);

v. arranging a coupling assembly (34) at the housing member (12) with contact up to the annular seal (35) and the at least one lip (16).

11. Use of a housing component (12) according to any one of claims 1 to 7 or of a device (33) according to claim 9 for supplying hydraulic fluid at high pressure.