Hydraulic valve with actuating device and housing unit

Abstract

A hydraulic valve (V) with an actuating device and a housing unit (G), wherein the housing unit (G) comprises a first housing part (1) with an internal thread (3) and a second housing part (2) with an external thread (4), wherein the external thread (4) of the second housing part (2) is screwed into the internal thread of the first housing part (1), wherein a valve piston (5) is arranged in the first housing part (1) and an actuating element (6) of the actuating device is arranged in the second housing part (2), wherein the actuating element (6) is operatively connected to the valve piston (5) in the axial direction, characterized in that the second housing part (2) is only partially screwed into the first housing part (1) in the assembled state of the housing unit (G), and the housing unit (G) further comprises a securing means,wherein the securing means, in the assembled state of the housing unit (G), prevents a relative movement between the internal thread (3) of the first housing part (1) and the external thread (4) of the second housing part (2) such that an operating point of the actuating device is set.

Description

[0001] The present invention relates to a hydraulic valve with an actuating device and a housing unit.

[0002] Hydraulic valves with actuating devices are generally known. The actuating device can, for example, be an electromagnetic actuation, a manual actuation, a hydraulic actuation, or a pneumatic actuation. Such hydraulic valves comprise a housing unit that includes a first housing part with an internal thread and a second housing part with an external thread. The external thread of the second housing part is screwed into the internal thread of the first housing part. A valve piston is arranged in the first housing part, and an actuating element of the actuating device is arranged in the second housing part. The actuating element is operatively connected to the valve piston in the axial direction.

[0003] Such actuating devices are used, among other things, in hydraulic directional or directional seat valves, which can also be designed as screw-in valves. In an electromagnetic actuating device, one or more electrical coils cooperate in a generally known manner with the actuating element designed as an armature to actuate the valve piston by axial displacement of the armature using magnetic force, thus achieving different switching positions of the respective hydraulic valve. The actuation of the valve piston by the armature is often achieved via a valve tappet, which is arranged between the armature and the valve piston and transmits the axial movement of the armature to the valve piston, thus forming the operative connection between the armature and the valve piston.

[0004] The second housing part is usually screwed completely into the first housing part over a relatively short threaded section, i.e. up to a stop in the first housing part, in order to minimize the overall installation space required and to prevent the housing parts from becoming loose.

[0005] When assembling such hydraulic valves, precise valve adjustment is essential. In particular, the interaction between the actuating device and the valve piston must be precisely adjusted to establish a working point for the actuating device on the force-stroke characteristic curve and thus positively influence the technical properties of the hydraulic valve, such as hydraulic parameters or wear characteristics. This valve adjustment is performed and checked manually during the assembly of each such hydraulic valve.

[0006] Currently, such valve adjustment is achieved by keeping individual components of the hydraulic valve in different designs, such as valve tappets of different lengths, or by machining individual valve components during assembly, for example by grinding. Valve adjustment requires regular measurements both in the disassembled and assembled state of the hydraulic valve, and in some cases the hydraulic valves have to be disassembled and reassembled several times in order to achieve the desired accuracy of the valve adjustment by iteratively approximating the desired operating point. Keeping individual components in different designs not only increases storage costs but also requires particular precision in the manufacture of the corresponding individual components. Manual machining during assembly entails increased time expenditure and also requires particular precision.

[0007] From the prior art, for example, AT 511 599 A4 discloses a valve device with a two-part housing unit. DE 10 2009 053 388 A1 discloses a hydraulic valve with a multi-part housing unit including disassembly protection. DE 10 2020 103 176 A1 discloses a hydraulic valve with a bushing and an adjusting thread for adjusting a spring preload, as well as a method for manufacturing the hydraulic valve.

[0008] Against this background, it is an object of the present invention to reduce the assembly effort for hydraulic valves with actuating devices and at the same time to enable reliable and precise adjustment of the hydraulic valves.

[0009] The problem is solved with a hydraulic valve according to claim 1.

[0010] The housing unit of the hydraulic valve according to the invention differs from the prior art in that the second housing part is only partially screwed into the first housing part in the assembled state of the housing unit and the housing unit further comprises a securing means, wherein the securing means prevents a relative movement between the internal thread of the first housing part and the external thread of the second housing part in the assembled state of the housing unit such that an operating point of the electromagnetic actuation is set.

[0011] In particular, the securing means is a releasable securing means. In particular, the first housing part is a valve piston housing and the second housing part is an armature housing. In particular, the housing unit is designed as a screw-in cartridge. The fact that the second housing part is "only partially" screwed into the first housing part means that the second housing part is not completely screwed into the first housing part up to a stop. The "assembled state" of the housing unit means that the housing unit according to the invention is fully assembled and adjusted and ready for its intended use. In particular, in the assembled state, no further measures for fine adjustment of the hydraulic valve need be taken by using the housing unit according to the invention.In the assembled state of the housing unit, the securing means prevents the relative movement between the internal thread and the external thread in such a way that the axial positioning of the first housing part relative to the second housing part is maintained even when the housing unit according to the invention is used in a hydraulic valve, in particular also under the influence of pressures in a hydraulic system in which the hydraulic valve is used.

[0012] The housing unit according to the invention enables the axial fine adjustment of an operating point of a hydraulic valve with an actuating device to be achieved solely by screwing the first housing part and the second housing part together, and by securing the axial position of the first housing part to the second housing part using the locking means. This enables fine adjustment of the hydraulic valve without having to keep various components in different designs or perform additional machining steps on components during assembly. Furthermore, for the axial fine adjustment, the first housing part and the second housing part no longer have to be completely separated from one another and screwed back together during assembly. The fine adjustment is achieved solely by screwing the first housing part and the second housing part together and securing the axial positioning using the locking means.By only partially screwing the second housing part into the first housing part, the axial variability required for fine adjustment of the operating point of the actuator is achieved. The internal thread of the first housing part and the external thread of the second housing part are thus axially longer than in conventional housing units.

[0013] It is advantageous if the actuating device is electromagnetic. In this context, it is also advantageous if the actuating element is an armature.

[0014] The securing means expediently comprises at least one separate component. This enables precise, reliable, and reversible securing of the axial positioning between the first housing part and the second housing part.

[0015] It is advantageous if the securing means comprises a thread sealing ring. The thread sealing ring is an embodiment of a separate component and is arranged in particular in a circumferential groove in the internal thread of the first housing part. Alternatively, the thread sealing ring can also be arranged in a circumferential groove in the external thread of the second housing part. Alternatively, a first sealing ring can be arranged in a first circumferential groove in the internal thread of the first housing part and a second sealing ring can be arranged in a second circumferential groove in the external thread of the second housing part. By configuring the securing means as a thread sealing ring, precise, reliable and reversible securing of the axial positioning between the first housing part and the second housing part can be achieved.

[0016] Advantageously, the securing means comprises a threaded pin that is screwed into a threaded bore in the first housing part and presses against the external thread of the second housing part. The threaded pin is an embodiment of a separate component. Furthermore, it is advantageous if the securing means comprises a plurality of threaded pins that are screwed into a corresponding number of threaded bores in the first housing part and press against the external thread of the second housing part. Furthermore, it is conceivable for the plurality of threaded pins and the corresponding threaded bores to be distributed evenly along the circumferential direction of the first housing part. Alternatively, the threaded pins and the corresponding threaded bores can also be distributed randomly along the circumferential direction of the first housing part.By designing the locking device as a threaded pin, a precise, reliable and reversible securing of the axial positioning between the first housing part and the second housing part can be achieved.

[0017] The locking device expediently comprises a lock nut. The lock nut is a separate component. By designing the locking device as a lock nut, precise, reliable, and reversible locking of the axial positioning between the first housing part and the second housing part can be achieved.

[0018] The securing means advantageously comprises a clamping thread. The clamping thread is an embodiment of a separate component. In particular, the clamping thread is arranged in an axial groove in the internal thread of the first housing part. Alternatively, the clamping thread can be arranged in an axial groove in the external thread of the second housing part. Alternatively, several clamping threads can be arranged in a corresponding number of axial grooves, wherein the axial grooves are arranged in the internal thread of the first housing part and / or in the external thread of the second housing part. By configuring the securing means as a clamping thread, precise, reliable, and reversible securing of the axial positioning between the first housing part and the second housing part can be achieved.

[0019] It is expedient if the locking means comprises a thread-locking agent. In particular, the thread-locking agent is applied between the internal thread of the first housing part and the external thread of the second housing part. By designing the locking means as a thread-locking agent, precise, reliable, and reversible securing of the axial positioning between the first housing part and the second housing part can be achieved.

[0020] It is advantageous if the locking means comprises a stiff thread. The stiff thread is advantageously implemented by changing the thread pitch diameter of the internal thread and / or external thread and / or by a different thread pitch of the internal thread and external thread and / or by a self-locking thread and / or by a stiff coating on the internal thread and / or external thread. By designing the locking means as a stiff thread, precise, reliable, and reversible securing of the axial positioning between the first housing part and the second housing part can be achieved.

[0021] Furthermore, the problem is solved with a hydraulic valve having an actuating device and a housing unit according to the invention. The actuating device is, in particular, an electromagnetic actuation device, wherein the electromagnetic actuation device comprises the armature and a coil arrangement. Advantageously, the hydraulic valve is a directional control valve, in particular a directional seat valve. The assembly effort of the hydraulic valve designed in this way is significantly reduced. At the same time, reliable and precise adjustment of the hydraulic valve is possible.

[0022] The invention is explained in more detail below with reference to embodiments shown in the figures. These schematically show: Fig. 1a a sectional view of a hydraulic valve with a first embodiment of a housing unit according to the invention; Fig. 1b a detailed view of Fig. 1a; Fig. 2a a sectional view of a hydraulic valve with a second embodiment of a housing unit according to the invention; Fig. 2b a detailed view of Fig. 2a; Fig. 3a a sectional view of a hydraulic valve with a third embodiment of a housing unit according to the invention; Fig. 3b a detailed view of Fig. 3a; Fig. 4a a sectional view of a hydraulic valve with a fourth embodiment of a housing unit according to the invention; Fig. 4b a detailed view of Fig. 4a; Fig. 5a a sectional view of a hydraulic valve with a fifth or sixth embodiment of a housing unit according to the invention; and Fig. 5b a detailed view from Fig. 5a.

[0023] Fig. 1a shows a sectional view of a hydraulic valve V with an actuating device in the form of an electromagnetic actuator. The hydraulic valve comprises a first embodiment of a housing unit G according to the invention with a first housing part 1 with an internal thread 3 and a second housing part 2 with an external thread 4. As shown in the Fig. 1b shown detailed view Fig. 1a, the external thread 4 of the second housing part 2 is screwed into the internal thread 3 of the first housing part 1. A valve piston 5 is arranged in the first housing part 1, and an actuating element in the form of an armature 6 of the electromagnetic actuation is arranged in the second housing part 2. The armature 6 is operatively connected to the valve piston 5 in the axial direction. In the illustrated embodiment, the armature 6 is operatively connected to the valve piston 5 via a valve tappet 12. This means that the valve tappet 12 enables an axial movement of the armature 6 when viewed towards Fig. 1a downwards onto the valve piston 5 and moves it to achieve different switching positions of the hydraulic valve V. A spring F acts as a return element on the valve piston 5.

[0024] The electromagnetic actuation comprises, in a generally known manner, the armature 6 and a coil arrangement which is Fig. 1a is not shown for the sake of clarity. The armature 6 is arranged in an armature chamber in the second housing part 2 and in Fig. 1a is shown only schematically, since different designs of armatures for electromagnetic actuators for hydraulic valves are generally known. The coil arrangement is arranged in a generally known manner in a separate component, which is pushed over the second housing part 2 during assembly of the hydraulic valve V and is arranged radially outside the second housing part 2 when the hydraulic valve V is assembled.

[0025] The hydraulic valve V of the illustrated embodiment is a 2 / 2-way seat valve with a conical seat, designed as a screw-in cartridge with electromagnetic actuation and emergency release N. As shown in Fig. 1a, the valve piston 5 rests against a valve seat 13 in the first housing part 1 and is therefore in its closed position in the position shown. Via a screw thread E, which is designed as an external thread on the first housing part 1, the housing unit G can be screwed into any hydraulic system in which it is to be used. The emergency release N comprises an actuating element 16, which can be actuated by a user as needed by inserting a tool into an opening 17 and pushed towards the armature 6 in order to lift the valve piston 5 from its valve seat 13 and manually unlock the hydraulic valve V.

[0026] As particularly in Fig. 1b, the second housing part 2 is only partially screwed into the first housing part 1. The housing unit G further comprises a locking means which, in the assembled state of the housing unit G shown here, prevents a relative movement between the internal thread 3 and the external thread 4 such that an operating point of the electromagnetic actuation is set.

[0027] As in Fig. As can be seen in Figure 1b, the second housing part 2 is not completely screwed into the first housing part 1 up to a stop 14. The securing means according to the first embodiment is a separate component in the form of a thread sealing ring 7, which is arranged in a circumferential groove 15 in the internal thread 3 of the first housing part 1.

[0028] Due to the extended screw-in distance between the internal thread 3 and the external thread 4 compared to conventional housing units, the axial positioning of the second housing part 2 relative to the first housing part 1, and thus the axial positioning of the armature 6 relative to the valve piston 5, can be precisely adjusted during assembly. Finally, the locking element, the thread sealing ring 7 in this embodiment, ensures that relative movement between the internal thread 3 and the external thread 4 is prevented, so that the axial positioning of the second housing part 2 relative to the first housing part 1 does not change even under hydraulic fluid pressure, thus setting the operating point of the electromagnetic actuation.This structural design of the housing unit G enables precise and reliable adjustment of the operating point of the electromagnetic actuation, without, for example, having to provide valve tappets 12 of different lengths or having to machine the valve tappet 12 during assembly, and possibly having to completely unscrew and re-insert the second housing part 2 from the first housing part 1 several times. This enables a significant increase in efficiency during assembly of the hydraulic valve V.

[0029] In the Fig. 2a to 5b show a second, third, fourth, fifth and sixth embodiment of the threaded unit G. The threaded unit G according to the Fig. 2a to 5b differs from the threaded unit G of the embodiments shown in the Fig. 1a and Fig. 1b solely by the design of the securing means. Therefore, only the aspects of the housing unit G relevant to the description of the respective securing means are shown in the Fig. 2a to 5b.

[0030] As in the Fig. 2a and Fig. As shown in Figure 2b, the securing means of the housing unit G according to the second embodiment comprises a separate component in the form of a threaded pin 8, which is screwed into a threaded bore 9 in the first housing part 1 and presses against the external thread 4 of the second housing part 2. More precisely, the securing means according to the second embodiment comprises two threaded pins 8 in two threaded bores 9, which are evenly distributed along the circumferential direction of the first housing part 1, namely arranged opposite one another. It is obvious to those skilled in the art that the securing means can also comprise three or more threaded pins 8 in a corresponding number of threaded bores 9.

[0031] As in the Fig. 3a and Fig. 3b, the securing means of the housing unit G according to the third embodiment comprises a separate component in the form of a lock nut 10. The lock nut 10 is arranged above the first housing part 1 on the external thread 4 of the second housing part 2. The outer diameter of the lock nut 10 is smaller than the outer diameter of the first housing part 1, so that in the assembled state of the first housing part 1 and second housing part 2, a user can bring a tool into engagement with the first housing part 1 via the lock nut 10 in order to screw it into a housing of a hydraulic system using the screw-in thread E.

[0032] As in the Fig. 4a and Fig. As shown in Figure 4b, the securing means of the housing unit G according to the fourth embodiment comprises a separate component in the form of a clamping thread 11. The clamping thread 11 is arranged in an axial groove in the internal thread 3 of the first housing part 1. However, it is apparent to those skilled in the art that the clamping thread 11 can also be arranged in an axial groove in the external thread 3 of the second housing part 2 and that the securing means can also comprise a plurality of clamping threads 11 in corresponding axial grooves.

[0033] As in the Fig. 1a to 4b, the securing means according to the first, second, third and fourth embodiments comprises at least one separate component. According to the first embodiment according to the Fig. 1a and Fig. 1b, the securing means comprises the thread sealing ring 7. According to the second embodiment according to Fig. 2a and Fig. 2b, the securing means comprises the threaded pins 8 in the threaded holes 9. According to the third embodiment according to Fig. 3a and Fig. 3b, the securing means comprises the lock nut 10. According to the fourth embodiment according to Fig. 4a and Fig. 4b, the securing means comprises the clamping thread 11.

[0034] As in the Fig. 5a and Fig.5b, the securing means of the housing unit G according to the fifth or sixth embodiment does not comprise a separate component. According to the fifth embodiment, the securing means comprises a thread adhesive. According to the sixth embodiment, the securing means comprises a stiff thread. The stiff thread can be realized by changing the thread flank diameter of the internal thread 3 and / or external thread 4 and / or a different thread pitch of the internal thread 3 and external thread 4 and / or a self-locking thread and / or a stiff coating on the internal thread 3 and / or on the external thread 4. The securing means according to the fifth and sixth embodiments also prevent a relative movement between the internal thread 3 and the external thread 4 in the assembled state of the housing unit G such that an operating point for the electromagnetic actuation of the hydraulic valve V is set.

[0035] It is obvious to the person skilled in the art that the securing means according to the embodiments described above can also be combined with one another if necessary, for example one or more threaded pins in combination with a thread sealing ring. Reference symbol 1 first housing part 2 second housing part 3 internal threads 4 external threads 5 valve pistons 6 Actuating element / armature 7 Thread sealing ring 8 threaded pin 9 threaded hole 10 Lock nut 11 clamping thread 12 valve tappets 13 Valve seat 14 stop 15 circumferential groove 16 Actuating element 17 Opening E screw thread F spring G Housing unit N Emergency release V Hydraulic valve

Claims

[1] Hydraulic valve (V) with an actuating device and a housing unit (G), wherein the housing unit (G) comprises a first housing part (1) with an internal thread (3) and a second housing part (2) with an external thread (4), wherein the external thread (4) of the second housing part (2) is screwed into the internal thread of the first housing part (1), wherein a valve piston (5) is arranged in the first housing part (1) and an actuating element (6) of the actuating device is arranged in the second housing part (2), wherein the actuating element (6) is operatively connected to the valve piston (5) in the axial direction, characterized byin that the second housing part (2) is only partially screwed into the first housing part (1) in the assembled state of the housing unit (G) and the housing unit (G) further comprises a securing means, wherein the securing means prevents a relative movement between the internal thread (3) of the first housing part (1) and the external thread (4) of the second housing part (2) in the assembled state of the housing unit (G) such that an operating point of the actuating device is set. [2] Hydraulic valve (V) according to claim 1, characterized by that the actuating device is an electromagnetic actuation and that the actuating element (6) is an armature. [3] Hydraulic valve (V) according to claim 1 or 2, characterized by that the securing means comprises at least one separate component. [4] Hydraulic valve (V) according to claim 3, characterized by that the securing means comprises at least one thread sealing ring (7). [5] Hydraulic valve (V) according to claim 3 or 4, characterized by that the securing means comprises at least one threaded pin (8) which is screwed into at least one threaded bore (9) in the first housing part (1) and presses against the external thread (4) of the second housing part (2). [6] Hydraulic valve (V) according to one of claims 3 to 5, characterized by that the securing means comprises at least one lock nut (10). [7] Hydraulic valve (V) according to one of claims 3 to 6, characterized by that the securing means comprises at least one clamping thread (11). [8] Hydraulic valve (V) according to one of the preceding claims, characterized by that the locking agent comprises a thread adhesive. [9] Hydraulic valve (V) according to one of the preceding claims, characterized by that the locking device includes a stiff thread. [10] Hydraulic valve (V) according to claim 9, characterized bythat the stiff thread is designed by a change in the thread flank diameter of the internal thread (3) and / or external thread (4) and / or a different thread pitch of the internal thread (3) and external thread (4) and / or a self-locking thread and / or a stiff coating on the internal thread (3) and / or on the external thread (4).

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