EP2235380A1

EP2235380A1 - Hydraulic valve device

Info

Publication number: EP2235380A1
Application number: EP08871663A
Authority: EP
Inventors: Winfried RÜB
Original assignee: Hydac Filtertechnik GmbH
Current assignee: Hydac Filtertechnik GmbH
Priority date: 2008-01-31
Filing date: 2008-12-18
Publication date: 2010-10-06
Also published as: US20110005623A1; DE102008006879A1; US8602055B2; WO2009095067A1

Abstract

The invention relates to a hydraulic valve device having a fluid port arrangement (10) with various ports which runs at least partially in the valve housing (14), and having a movable control device (18) for at least partially activating ports of the fluid port arrangement (10), wherein the control device (18) can be acted on at two opposite control sides with a control pressure (XA, XB) of an assignable activation unit (46). A valve device which is of narrow construction and which is functionally reliable is created in that a media-conducting duct (66), the guide path of which runs at least partially as an open duct channel which can be closed off by a cover part or by other housing parts of the multi-part valve housing (14), serves to conduct the control pressure (XB) from the activation unit (46) to the assignable control side of the control device (18).

Description

Hydac Filtertechnik GmbH, industrial area, 66280 Sulzbach / Saar

Hydraulic valve device

The invention relates to a hydraulic valve device having a fluid connection arrangement at least partially extending in the valve housing, including connections such as a pressure supply connection P for providing a working pressure, a return connection R, a section load sensing connection LS, two control connections P'A and P'B and two utility connections A. B for providing a Nutzanschluß- pressure, and with a movable control device for at least partially driving terminals of the fluid connection arrangement, wherein the control means on two opposite control sides with a control pressure XA, XB of a assignable drive unit can be acted upon.

EP 1 370 773 B1 discloses a directional control valve for controlling the pressure and flow of hydraulic oil from or to utility ports of at least one consumer, wherein the pressure and flow rate are controllable by means of a spool actuated by at least one drive and displaceable within a spool bore so that operatively connected ring channels can be controlled as part of the fluid connection arrangement, wherein in the center of symmetry on an axis of symmetry Tank connection ring channel R is arranged and on both sides more annular channels are arranged symmetrically, which are also part of the fluid connection arrangement of the directional control valve. The spool as part of the known control device is controlled by a drive unit, which predefines the respective control pressure on the opposite control sides of the spool. The drive unit used is, inter alia, a differential cylinder arranged on one side of the actual valve housing, which causes actuation for both stroke directions of the optionally also two-part slide piston and which constitutes a separate component.

By WO 2006/005496 A1 a generic valve device, in particular in the form of a Hubwerksventilanordnung known. The known solution is used to control a double-acting hoist or an attachment of an agricultural utility vehicle with a continuously adjustable, a metering diaphragm forming directional valve, which is associated with an individual pressure compensator through which a pressure fluid flow to a working port A, B flows, via another working port A, B flows back flowing pressure medium via the directional valve to a low pressure or tank connection T and with a pressure relief valve, which is arranged in a working line between the directional control valve and the working port A, B.

The pressure-limiting valve is preferably designed to be proportionally adjustable, so that the pressure in the working line can be limited to different maximum values as a function of different operating states. For controlling the control device in the form of the spool of the addressed directional control valve is a control or pilot valve whose fluid-carrying output ports are connected to two control lines, which are each guided to the frontal control chambers of the directional control valve. In this case, the one control line that leads to the coming control chamber side of the directional control valve, coming forward control or pilot valve coming as a long, executed in cross-section very thin connection hole, including suitable drilling tools must be provided. A comparable solution for this purpose is also shown in DE 603 04 663 T2.

Based on this prior art, the present invention seeks to improve the known valve devices to the effect that in a very space-saving manner, the constructive solution is achieved, which is otherwise functionally reliable and can be produced inexpensively. This object is achieved by a valve device with the features of claim 1 in its entirety.

Characterized in that according to the characterizing part of claim 1 for the forwarding of the control pressure from the drive unit to the assignable control side of the control device a media-conducting channel is used, the guideway at least partially runs as an open channel guide, of a cover part or other housing parts of the multi-part Valve housing is closed as a closure part, a valve solution is provided in which the drive unit preferably using the aforementioned control or pilot valves directly on the control device, preferably in the form of at least one control piston or valve piston, act without requiring an additional actuating piston in shape a differential cylinder or the like would be necessary. By dispensing with a separate actuating piston can be saved in addition to manufacturing costs also the otherwise necessary installation space.

On account of the embodiment according to the invention, the medium-conducting channel with open channel guidance, which can be produced cost-effectively, for example by means of a conventional milling tool, replaces the long and thin connection. Dungsbohrung for establishing the pressure connection between the control side of the control device and said drive unit, so that the manufacturing costs are reduced and the rest can be performed in a space-saving manner, the open channel guide covering cover or other housing part - even at high fluid pressures - very thin-walled, so that in particular very slim building valve solutions can be achieved in a width, as they can not provide the other prior art.

In the case of mobile directional control valves, as in the present case, with electrical control, the assignable control electronics are increasingly integrated into the valve housing for expediency considerations and in a space-saving manner. For pilot operated valves, as in this case, a driving pressure for moving the valve spool or slide piston is used accordingly. If two-sided control units are used, the object is a compact and cost-effective arrangement of the control electronics for the two control valves or pilot valves. With the solution according to the invention, the pertinent demands are taken into account, wherein neither electrical nor hydraulic control lines must be routed outside the valve housing, which is also shown in the prior art. The valve device solution according to the invention is preferably used in so-called compact machines, preferably used in the context of the so-called exhaust aftertreatment and coolers, where the current exhaust gas guidelines in the important industrialized countries require an ever higher construction effort, so that for other components, such as the hydraulic solution mentioned , Inasmuch as less and less space remains. The mobile valves must therefore be designed to be particularly narrow, which is achieved with the hydraulic valve device according to the invention. Further advantageous embodiments are the subject of the dependent claims.

In the following the hydraulic valve device according to the invention will be described with reference to an embodiment of the drawing. This show in principle and not to scale representation of the

1 shows a longitudinal section through the entire valve device in a perspective view;

2 shows a front view of the valve device according to the Fig.1, but without fluid management in the form of the media channel and the

3 shows a detail relating to the valve block according to FIGS. 1 and 2 with the fluid-carrying line parts with the inclusion of the fluid guide in the form of the media channel according to FIG.

The figures show a designated as a whole with 10 Fluidanschluß- arrangement. The pertinent fluid port assembly 10 has a pressure supply port P for providing a working or pumping pressure, a return port R, a section load sensing port LS, two control ports PΑ and P'B, and two payload ports A, B. Said fluid connections LS, P'A, RT and P'B, A and B are accommodated in a control housing 12 as part of the valve housing 14. Viewed in the direction of the figures, the lower end of the control housing 12 has a common annular channel arrangement 16, in which a non-illustrated pressure balance can be used if necessary, which is then upstream of said fluid connection assembly 10 in the fluid flow direction and this can control so far with. With one to that effect Upstream pressure balance, for example, the function of the so-called. Mengenabschneidung by LS - pressure limitation possible, with a pertinent Mengenabschneidung example makes sense if a not shown steering cylinder connected to the Nutzanschlüssen A, B is at the stop and you to avoid overloads the inflow want to cut off. The present valve device but comes from their basic function ago without a preceded by this pressure compensator.

Furthermore, the hydraulic valve device according to the invention is equipped with a control device designated as a whole by 18. Said control device 18 is equipped with two seen in the direction of Figures 1 and 2 horizontally displaceable control slides 20,22, which are shown in their undeflected, centered center or Neutralstellurig. The pertinent neutral position of the respective spool 20, 22 is supported by two spring memories, which are designed as compression springs 24, 26 and are integrated in a respective assignable spring chamber 38, 40 within the housing arrangement shown. The spool assembly shown with two spools 20, 22 may be formed depending on the purpose of the directional control valve as a one-piece and thus einkolbige control arrangement (not shown). In the present case, however, a two-spool arrangement is preferably selected, wherein the respective spools 20, 22 can be supported on a pin-shaped center stop 42; otherwise the constructive construction of the respective control slide 20, 22 with internally guided, spring-supported inner piston 44 is known, so that will not be discussed in more detail here at this point.

To drive the control device 18, a drive unit designated as a whole by 46 serves as the essential component two usual control and pilot valves 48, 50, which are therefore not described any further having. On the output side, the two pilot valves 48, 50 deliver two counteracting control pressures XA and X ₈ , which are present in the respective assignable spring chamber 38 or 40 and insofar influence the two opposite control sides of the control device 18 with the two control slides 20, 22. To penetrate the control pressure XA from the output side of the pilot valve 48 to the associated control side in the form of the first spring chamber 38 is an oblique bore 52 in the drive housing 54, which is part of the valve housing 14, and in which at least partially the power or control electronics 56 is included the illustration according to FIGS. 1 and 2 shows only the two plug parts shown above as electrical connection. The two control or pilot valves 48, 50 are shown in FIGS. 1 and 2 shown in vertical superposition arrangement and their operable valve piston 58 have adjustment directions on parallel to the respective longitudinal displacement axis of the two control spool 20, 22nd

Moreover, as viewed in the direction of FIGS. 1 and 2, the left-hand control slide 22 engages in a central center recess 60 between the two valves 48, 50 in the control housing 54. The drive housing 54 is connected in the manner of a Flanschanschlußlösung with the left end side of the control housing 12 so as to realize a flat valve solution constructed. On the opposite end of the right spool valve 22 opens into a terminal housing 62, which in turn for the realization of the narrow-building valve in width only a slight dimension has fügige and so far on the opposite end of the control housing 12 also in the manner of a flange connection without Overhang connects. The respective flange connection is realized by means of conventional screw connection solutions 64, wherein for ease of illustration not all fixing screws are shown. The terminal housing 62 also ensures a simpler mounting structure and allows disassembly for maintenance purposes the overall valve arrangement. Control housing 12, drive housing 54 and terminal housing 62 together form the multi-part valve housing 14.

For the forwarding of the control pressure XB from the drive unit 46 to the assignable right-hand control side of the control device 18 is a media-conducting channel, in particular fluid-carrying channel 66 is present, the guideway, in particular from the illustration of FIGS. 1 and 3 results and for ease of illustration in Fig.2 is omitted. In particular, an open channel guide is realized, which can be closed by a cover part or other housing parts of the multi-part valve housing 14 as a final part. In the embodiment of Figure 3 would be a conclusion of the open channel 66 with a cuboid and flat designed cover part conceivable that is to be connected as part of the valve housing and thus as a closure part with the other valve housing 14, for example, by placing the cover part over a not shown screw connects with the other valve housing 14. In the embodiment according to FIG. 1, which relates essentially to a longitudinal section through the valve housing 14, which is otherwise shown in half, the correspondingly designed valve housing side, which in this respect represents the other half, would have to be fluid-tightly connected to the illustrated valve housing. The thus to the housing section shown complementary formed housing part piece could then comparable to the illustration of Figure 1 have a corresponding channel guide a channel, which then interacts with the channel shown corresponding media-leading.

The guideway of the media channel 66 is up to the two media passage points 68, 70 to assignable control side of the control device 18 and the drive unit 46 by means of a sealing device 72, the easier representation because not shown in Figure 1, compared to the attachable end part (cover part or valve housing part) media in particular fluid-tight separated. The sealing device 72 may be a circumferential lip seal (FIG. 3) made of elastomeric material or the like which can be inserted, for example, into a circumferential groove which sealingly encloses the respectively addressed media channel 66 with the two media passage points 68, 70. How further the Fig.! 3, the guide track of the media channel 66 has a first track section 74, which is arranged substantially horizontally in the direction of the figures and parallel to the displacement directions of the control slides 20, 22. The first path opens towards its respective free end central track section into two further track sections 76 which have a downwardly inclined inclination relative to the first track section 74. The turn both free ends of the inclined track portions 76 then open in each case two end portions 78 as a third track sections, which in turn extend in a horizontal arrangement parallel to the first track section 72. In each of these end portions 78 then open the media passage points 68, 70 a. The extent symmetrically constructed media channel 76 has proven to be particularly favorable for a laminar flow, so that any power losses in the fluid management, for example due to turbulence, do not arise.

The valve device according to the invention is particularly preferably used for the control of hydraulic oil; However, other applications are also conceivable in which the medium is gaseous, for example for the realization of a pneumatic valve or other fluids, such as fuels, cooling lubricants, etc. As further shown in FIG. 1, the control or pilot valve 50 opens on its output side into a fluid-carrying pilot space 80, which opens into the media passage point 68 via only an oblique bore 82 (FIGS. A corresponding slanted channel guide 84 (Figure 3) is provided for Connection of the media channel 76 via its passage point 70 with the rear spring chamber 40 of the control device 18th

With the said fluid guide arrangement, the two pilot valves 48, 50 each control the associated end face of the control slide 20, 22. The upper control or pilot valve 48 seen in the direction of FIG. 1 controls the pressure X _A in the left pressure chamber at the left end of the control spool 20, whereas the lower pilot valve 50 controls the pressure X B in the control line to the right end of the spool 22 pretends. Thanks to the valve device arrangement according to the invention, there is no need to use an additional differential or actuating piston for driving to come to the desired narrow constructive valve design. Instead of using a long, thin drill, which is susceptible to failure, for producing the pressure guide in an alternative embodiment, the described media-carrying channel 66 can be created in a very favorable manufacturing manner by means of a stable milling tool, so that the reject rates of the valve during manufacture against Go zero. It is surprising for a person of ordinary skill in the art that, due to the valve design shown, in which the control housing 54 with all important structural components is flange-mounted on the other control housing 12 without any contact with the essential valve components, it achieves such narrow valve designs, which despite the complexity of the valve allow construction with a width of less than 40 mm. If it does not matter in such a way to keep the size of the valve device very small or narrow, so far created in the inventive solution, a further constructive degree of freedom, then just make the power-carrying channels larger, which makes it easier, the required fluid quantities for the Make work connections obvious, especially larger volumes of fluid can be controlled. Due to the low drive pressure in the groove-like connection channel construction, the distance from the wall to the pressure-carrying pressure chambers can be made small, so that the additional pressure load on the respective flange surface remains small, which in turn benefits the reliability of the valve device as a whole.

Claims

Patent claims

A hydraulic valve device comprising a fluid port assembly (10) at least partially extending within the valve housing (14) including ports such as a pressure supply port (P) for providing a working pressure, a return port (R), a section load sensing port (LS), two control ports (P'A and P'B) and two Nutzanschlüsse (A, B) for providing a Nutzanschlußdruckes, and with a movable control means (18) for at least partially driving terminals of the fluid connection assembly (10), wherein the control means (18) to two opposite each other

Control pages with a control pressure (XA, XB) an assignable drive unit (46) can be acted upon, characterized in that for the forwarding of the control pressure (XB) from the drive unit (46) to the assignable control side of the control device (18) a medienlei- tender channel (66) whose guideway extends at least partially as an open channel guide, which is closed by a cover part or other housing parts of the multi-part valve housing (14) as a closure part.

2. Valve device according to claim 1, characterized in that the guide track of the media channel (66) except for media passage points (68, 70) to the assignable control side of the control device (18) and the drive unit (46) by means of a sealing device (72) relative to the attachable end part Media-tight is separated.

3. A valve device according to claim 2, characterized in that the guide track of the media channel (66) has a first path section (74) which opens to its respective free end in a further web section (76), each opposite the first web section (74 ) has a slope.

4. A valve device according to claim 3, characterized in that the first track section (74) forms a central section adjacent to the control device (18), which merges at its ends into the further inclined track sections (76) as intermediate sections which in turn engage with their free ends in end portions (78), which are aligned parallel to the direction of the first web portion (74).

5. A valve device according to claim 4, characterized in that the end portions (78) open out with their free ends once in the direction of the drive unit (46) and once in the direction of the assignable control side of the control device (18).

6. Valve device according to one of claims 1 to 5, characterized in that the control device (18) from at least one control slide (20, 22) is formed, which is spring-centered in an initial position can be brought.

7. Valve device according to one of claims 1 to 6, characterized in that the drive unit (46) at least two control valves

(48, 50), of which a control valve (48) controls one control side (XA) and the other control valve (50) controls the other control side (XB) of the control device (18).

8. Valve device according to claim 7, characterized in that the respective control valves (48, 50) of the drive unit (46) in a building unit summarized together on a front side of the other valve housing (14) are arranged.

9. A valve device according to claim 8, characterized in that the connection end face of the valve housing (14) for the drive unit (46) is seen narrow in cross section, preferably together with the end part is at most 40 mm wide.

10. Valve device according to one of claims 7 to 9, characterized in that the control valves (48, 50) are arranged with their actuating direction parallel to the actuating direction of the control device (18).