DE102012101715B4 - Coupling for connecting two hydraulic systems - Google Patents

Abstract

A coupling (10) for connecting a hydraulic line (110) of a first hydraulic system (100) under pressure with a fluid (12) to a second hydraulic system (200), having a plug part (20) connectable to the second hydraulic system (200) is a sleeve part (40) having a sleeve valve (41) into which a system plug (120) with a closed system valve (121) of the hydraulic line (110) can be inserted, wherein a control element (60) formed in a housing (11) the coupling (10) is provided that when coupling the system plug (120) with the sleeve part (40), the sleeve valve (41) can be brought into an open state (1), wherein the system valve (121) in a closed state (6 ) remains, characterized in that the adjusting element (60) from the second hydraulic system (200) outgoing pressure increase in the sleeve part (40), whereby a fluid (12) from the second hydraulic system (200) in the sleeve part (40) is strömbar t and the system valve (121) of the hydraulic line (110) can be brought into an open state (5), wherein the sleeve valve (41) remains in the open state (1), and that at a subsequent pressure reduction from the second hydraulic system (200) the sleeve valve (41) and the system valve (121) remain unchanged in the open state (1, 5), wherein the fluid (12) in the direction of the second hydraulic system (200) is zurückströmbar until the hydraulic line (110) of the first hydraulic system (100) is depressurized, wherein the adjusting element (60) has at least one recess (61) through which the pressure increases the fluid (12) from the second hydraulic system (200) to the sleeve part (40) and / or when reducing the pressure fluid (12) from the sleeve part (40) to the second hydraulic system (200) can be flowed, and wherein the recess (61) is designed geometrically such that when pressure is reduced in the second hydraulic system (200) a fluid return in the direction of the second Hydrau liksystems (200) is provided in which the sleeve valve (41) and the system valve (121) in the open state (1, 5) remain.

Description

The invention relates to a coupling for connecting a fluid under pressure hydraulic line of a first hydraulic system with a second hydraulic system, with a plug part which is connectable to the second hydraulic system, a sleeve valve having a female part into which a system plug with a closed system valve Hydraulic line can be inserted. In addition, the invention relates to a system for relaxing a pressurized hydraulic fluid line of a first hydraulic system with a coupling connecting the first hydraulic system to a second hydraulic system, the coupling comprising a plug part connectable to the second hydraulic system, and a sleeve part formed with a sleeve part, into which a system connector with a closed system valve of the hydraulic line can be coupled. In addition, the invention comprises a method for relaxing a hydraulically pressurized hydraulic line of a first hydraulic system with a coupling which connects the first hydraulic system to a second hydraulic system, wherein the coupling is a plug part which is connectable to the second hydraulic system, and with Having a sleeve valve formed sleeve part into which a system plug with a closed system valve of the hydraulic line can be coupled.

From the prior art, the problem is known that pressurized hydraulic lines can not be readily connected to hydraulic systems subsequently. In particular, it has been shown that even with a lot of force a coupling of this pressurized hydraulic line to a hydraulic system is not possible. For example, these problems arise in the field of agriculture, wherein a tractor, in particular a tractor, which is the first hydraulic system, is to be connected to a hydraulic line of the second hydraulic system. The second hydraulic system can, for. B. to be pulled agricultural machine such. B. be a plow. The overpressure in the hydraulic line of the second hydraulic system can arise, for example, via the solar radiation, so that even pressures of more than 200 bar can occur within the hydraulic lines. This means that in the hydraulic systems, in particular the hydraulic attachments contained fluid, such as oil, is enclosed by the self-sealing quick couplings on the hydraulic lines and can not escape. With increasing temperature, mainly due to the just mentioned solar radiation, the whole hydraulic system is heated and the fluid pressure can rise drastically. Since the fluid can not be compressed as a rule, very high pressures can arise in the hydraulic systems, in particular in the hydraulic line, which is exposed to the aforementioned solar radiation, with the consequence that the hydraulic systems can suffer and thus the operation is disturbed can.

Since the hydraulic line, which is under such high pressure, can not be connected to the other hydraulic system, often an improper "processing" of the system plug of the hydraulic line, which is closed at a high pressure. It has disadvantageously been shown that this improper tools such as hammer and chisel are used to relax the pressure of the hydraulic line, which may, for example, damage to the system plug of the hydraulic line. In addition, often the fluid of the hydraulic line passes unhindered into the environment, or into the soil and then into the groundwater.

From the prior art (journal Profi 1/2012, p. 32), it is known to solve the problem described above via a pressure compensation cylinder. After the hydraulic line of one hydraulic system has been decoupled from the further hydraulic system, the hydraulic line is connected to the pressure compensation cylinder. If the fluid expands within the hydraulic line, the fluid can escape into the pressure compensation cylinder. The next time you attach it, the hydraulic line is removed from the pressure balance cylinder coupling and can easily be coupled to a hydraulic system. A major disadvantage, however, is that the pressure compensation cylinder must be connected to the hydraulic line during the entire time. This means that for any hydraulic system where there is a risk of pressurized hydraulic lines, pressure equalizing cylinders must be connected. This represents a costly solution.

A conventional clutch is further from the US 2,735,696 A. known, however, is not removable and must be fixed to one of the hydraulic systems.

Another generic state of the art offers the DE 28 54 511 C3 US-A-4/514531 discloses a clutch which requires a plurality of internal mechanical components to provide pressure equalization between the first hydraulic system and the second hydraulic system. It has been found to be a disadvantage that the coupling is complicated and must be fixed to one of the hydraulic systems. In addition, it is disadvantageous that a pressurized second hydraulic system is difficult to connect to a first hydraulic system.

The object of the present invention is to avoid the above-mentioned disadvantages, in particular to provide a coupling which is simple in construction, is removable and which reliably enables the pressurized hydraulic line to be expanded and thus a connection of the hydraulic line of the one Hydraulic system to a second hydraulic system without exaggerated effort is possible.

The object of the present invention is achieved by all features of claim 1. In the dependent claims, possible embodiments of the invention are described.

According to the invention, a control element designed in such a way is provided in a housing of the coupling that when the system plug is coupled to the sleeve part, the sleeve valve can be brought into an open state, the system valve remaining in a closed state, the control element an increase in pressure in the sleeve part starting from the second hydraulic system allows, whereby a fluid from the second hydraulic system in the sleeve part is flowable and the system valve of the hydraulic line can be brought into an open state, wherein the sleeve valve remains in the open state, in a then starting from the second hydraulic system pressure reduction, the sleeve valve and the system valve unchanged in the open Condition remain, wherein the fluid in the direction of the second hydraulic system is zurückströmbar until the hydraulic line of the first hydraulic system is depressurized, wherein the actuating element has at least one recess through which at pressure increase, the fluid from the second hydraulic system to the sleeve part and / or pressure reduction, the fluid from the sleeve part to the second hydraulic system is flowable, and wherein the recess is designed geometrically such that at pressure reduction in the second hydraulic system, a fluid return in the direction of the second hydraulic system is provided at the sleeve valve and the system valve remain in the open state.

In this case, preferably, the plug part and the sleeve part forms a common component, which is connected at its sleeve part with the system plug of the hydraulic line. The plug part, however, can be connected to a system sleeve of the second hydraulic system. It is also conceivable that the plug part is connected via a pipe element or a hose on the second hydraulic system. Thus, the excessive pressure in the hydraulic line can be reduced, the closed system valve of the system connector of the hydraulic line is transferred from its closed state to the open state via an increase in pressure. In this case, it is necessary for the pressure increase to be greater than the overpressure prevailing in the hydraulic line. According to the invention, the adjusting element, which is located between the plug part and the socket part of the coupling, is designed such that it allows the pressure increase in the socket part. In this case, fluid flows from the second hydraulic system along the actuating element into the sleeve part and presses the closed system valve of the hydraulic line into an open state. At this point it should be mentioned that the sleeve valve is already in the open state. The open state of the sleeve valve is made by moving the sleeve valve of the sleeve part to the open state upon coupling of the system plug of the hydraulic line. If now sleeve valve and system valve are in the open state, an exchange of the fluid between the clutch, in particular the sleeve part and the first hydraulic system, in particular the system plug of the hydraulic line can be done. It sets a common total pressure within the clutch and the hydraulic line of the first hydraulic system. If now, starting from the second hydraulic system, a pressure reduction, the fluid flows in the direction of the second hydraulic system, wherein z. B. the fluid from the system connector, sleeve part in the direction of the control element can flow, the actuator according to the invention provides for the fluid such a flow path that both the sleeve valve and the system valve remain unchanged in their open states. The backflow of the fluid takes place until the hydraulic line of the first hydraulic system is depressurized. Here, a display element may be provided on the clutch, which indicates to the user the internal pressure of the clutch. Subsequently, the coupling according to the invention can be decoupled from the first and from the second hydraulic system. The now relieved pressure hydraulic line can be connected without exaggerated force directly on the second hydraulic system. It is also conceivable that the coupling remains attached to the first and the second hydraulic system, so that both systems can be operated for normal operation.

According to the invention, the sleeve part has a chamber in which the sleeve valve is movably mounted, wherein a spring element arranged within the chamber acts on the sleeve valve. When the system plug is coupled to the sleeve part, a force is exerted against the spring element of the sleeve valve, so that in the coupled state of the system connector on the sleeve part, the sleeve valve reaches its open state. Within the chamber of the sleeve part, a stop may be provided which limits the displacement of the sleeve valve within the chamber of the sleeve part. Also, the plug part may have a chamber in which a plug valve is slidably mounted.

In a measure improving the invention it can be provided that the actuating element has at least one recess through which the fluid from the second hydraulic system to the sleeve part and / or pressure reduction, the fluid from the sleeve part to the second hydraulic system can be flowed at pressure increase. For example, it is conceivable that the recess is an opening having a cross-sectional diameter which is approximately between 0.5 mm and 1.2 mm, in particular which is approximately between 0.6 mm and 0.9 mm, particularly preferably is about 0.6 mm. The opening may be circular, polygonal or oval. Of course, a multiplicity of openings are conceivable, through which the fluid can flow when the pressure increases and when the pressure is lowered. Alternatively and / or additionally, it is conceivable that the recess is a groove, which is arranged in particular on the side of the adjusting element, which faces the second hydraulic system. It can also be provided a plurality of grooves along which the fluid can flow at pressure increase and / or pressure reduction.

The function of the recess can be described as follows: When increasing the pressure, the recess provides the fluid with a flow path in order to reach the sleeve part and thus the system plug of the hydraulic line, in order to open the closed system valve there with a corresponding pressure. It is particularly advantageous that in the subsequent pressure reduction of the pressure within the sleeve part does not fall rapidly, which would be associated with a closing of the system valve of the hydraulic line, which is not desired in the context of this invention. In the pressure reduction, it is necessary that according to this invention, both valves, in particular the system valve of the hydraulic line and the sleeve valve of the sleeve part remain in their open state. This is inventively achieved in that a relatively slow fluid return in the direction of the second hydraulic system is provided, which is effected by the adjusting element, in particular by the corresponding geometric configuration of the recess, be it through the opening or through the groove.

For example, it is conceivable that a flow cross-section for the fluid at pressure increase and pressure reduction is present on the adjusting element, wherein the flow cross-section is formed at least by the recess. In addition, it is conceivable that the adjusting element is designed such that when the pressure is increased and the pressure is lowered, the flow cross-section is the same. This means that when the pressure is lowered and the pressure is increased, the fluid flows through the opening and / or through the groove, and thus the geometry of the groove or the geometry of the opening define the flow cross section.

Alternatively, it is conceivable that the adjusting element is designed such that when the pressure increases the flow area is greater than the flow area at pressure reduction. With this implementation alternative, a faster increase in pressure can take place over time than a reduction in pressure. This is effected by the fact that the actuator provides the fluid with the pressure increase a larger flow area in the region of the actuating element than in the case of pressure reduction.

In a measure improving the invention, provision may be made for the adjusting element to be movably mounted within the housing, it being possible for the adjusting element to be brought into a first working area and for lowering the pressure in a second operating area when the pressure increases. The actuator can, for. B. be moved over the resulting increased pressure from its first working area in the second work area. The movement can be done in a translational manner. It is also conceivable that the adjusting element is pivoted and / or rotationally moved between the first and the second working area. According to its arrangement within the housing, the actuator can provide in the first working area a flow area for the fluid, which is different in size to the flow area, which is provided in the second work area the fluid from the actuator available.

In one possible embodiment of the invention, the actuating element may have an end face which rests against the housing during pressure reduction and is spaced apart from the housing when the pressure is increased, so that the flow cross-section is smaller when the pressure is being lowered than when the pressure increases. In this embodiment, the end face is sealingly against a defined portion of the housing, so that the fluid is provided a small flow area. If, on the other hand, there is an increase in pressure, the actuating element is located in the first working region, wherein the end face is detached from the housing, so that a larger flow cross-section is available to the fluid.

The presence of a large Durchströmquerschnittes at pressure increase advantageously has the advantage that a timely opening of the closed system valve of the hydraulic line can be done. About the small flow area at the pressure reduction is advantageously achieved that reliably both valves, d. H. the system valve of the hydraulic line and the sleeve valve of the sleeve part remain open.

Advantageously, the actuator can be metallic and / or plate-like. The actuator can be angular, circular, oval, convex, concave. For example, the adjusting element may be formed as a stamped part. In the installed state within the housing open spaces can form due to the geometry of the actuating element, which together with the recess of the actuating element provide a flow cross section for the fluid at pressure increase and / or pressure reduction. Depending on the working range of the control element, the open spaces may or may not be closed.

The above object is further achieved by a system according to independent claim 14. In the dependent claims advantageous embodiments are listed.

According to the invention a system for relaxing a fluid under pressure hydraulic line of a first hydraulic system is provided, with a coupling which connects the first hydraulic system with a second hydraulic system, wherein the coupling is a plug part, which is connectable to the second hydraulic system, and with having a sleeve valve formed in the socket part, in which a system connector with a closed system valve of the hydraulic line can be coupled, wherein that in the housing of the clutch is designed such a control element that when coupling the system plug with the sleeve part, the sleeve valve can be brought into an open state, wherein the system valve remains in a closed state, the actuator allows an outgoing pressure from the second hydraulic system pressure increase in the sleeve part, whereby a fluid from the second hydraulic system in the sleeve part is flowable and the system valve of the hydraulic line in an open state can be brought, wherein the sleeve valve remains in the open state, remain at a subsequent outgoing pressure from the second hydraulic system, the sleeve valve and the system valve remain unchanged in the open state, the fluid in the direction of the second hydraulic system is zurückströmbar until the hydraulic line the first hydraulic system is depressurized.

It can also be inventively provided that the sleeve part has a chamber in which the sleeve valve is movably mounted, wherein a spring element arranged within the chamber acts on the sleeve valve, wherein the system connector has a chamber in which the system valve is movably mounted, wherein a disposed within the chamber of the system connector spring element acts on the system valve, wherein the spring force of the spring element of the sleeve part is equal to the spring force of the spring element of the system connector, resulting in a floating position of the system valve and the sleeve valve after the pressure increase, wherein the system valve and the sleeve valve remain open and an equal pressure in the chamber of the system plug and in the chamber of the sleeve part is adjusted. It is particularly advantageous that the floating position remains after the pressure reduction.

Advantageously, the first hydraulic system may be an agricultural machine to be pulled and the second hydraulic system may be a towing agricultural machine, in particular a tractor. It is conceivable that the tractor is designed as a tractor. The agricultural machine to be pulled z. B. a plow or a dump truck, etc. be.

According to the invention, the housing of the coupling is designed so that the adjusting element is exchangeable. If the recess, in particular opening or groove should become clogged due to particles within the fluid, it may be advantageous to be able to remove the actuator from the housing of the clutch to perform a cleaning of the actuator or replace the actuator with a new actuator.

The object of the present invention is further achieved by a method having all the features of claim 18. The dependent method claims represent possible embodiments.

According to the invention, a method is provided for relaxing a pressurized fluid line of a hydraulic system of a first hydraulic system, with a coupling which connects the first hydraulic system with a second hydraulic system, wherein the coupling is a plug part, which is connectable to the second hydraulic system and one with a In which a system plug with a closed system valve of the hydraulic line can be coupled, wherein the housing of the clutch is designed such a control element is arranged, that when coupling the system plug with the sleeve part, the sleeve valve is brought into an open state, said the system valve remains in a closed state, the actuator allows an emanating from the second hydraulic system pressure increase in the sleeve part, whereby a fluid from the second hydraulic system flows into the sleeve part and the system valve of the hydraulic line in a In the open state, with the sleeve valve remaining in the open state, the sleeve valve and the system valve remain unchanged in the open state in a subsequent pressure reduction from the second hydraulic system, wherein the fluid in the direction of the second hydraulic system so long flows back until the hydraulic line of the first hydraulic system is depressurized.

According to the invention, the coupling of both hydraulic systems can be released and the system plug of the hydraulic line can be connected to the system sleeve of the second hydraulic system. It is also conceivable that the coupling remains attached to the first and the second hydraulic system, so that both systems can be operated for normal operation. Alternatively and / or additionally, when the pressure increases, the plug valve of the plug part can open and the fluid can flow into a chamber of the plug part and then through the coupling to the chamber of the socket part.

Further advantages, features and details of the invention will become apparent from the following description in which several embodiments of the invention are described in detail with reference to the drawings. The features mentioned in the claims and in the description may each be essential to the invention individually or in any desired combination. Show it:

1 a first embodiment of a coupling having a plug part, a sleeve part, and an actuating element within its housing,

2 an enlarged view according to 1 in the region of the coupling in which the actuating element is arranged,

3 the clutch according to 1 which is connected to a first hydraulic system,

4 an enlarged view of the area B according to 3 wherein an increase in pressure has taken place starting from the second hydraulic system in the socket part of the coupling,

5 a further embodiment of a coupling which is connected to a first and to a second hydraulic system, wherein there is an increase in pressure in the sleeve part,

6 an enlarged view of the area B according to 5 .

7 the embodiment according to 5 , wherein there is a pressure reduction starting from the second hydraulic system,

8th a sectional view along the section line AA according to 6 .

9 a further embodiment of an actuating element, the alternative in a clutch according to 3 or 5 can be used,

10 a further embodiment of an actuating element, which in a coupling according to 3 or 5 can be used and

11 another embodiment of a coupling.

In 3 . 5 and 11 are two essentially identical couplings 10 shown with a first hydraulic system 100 and a second hydraulic system 200 coupled or can be coupled. The first hydraulic system 100 can z. B. to be pulled agricultural machine, especially a plow, a seeder or, for example, a tipper. The second hydraulic system 200 On the other hand, a pulling agricultural machine, in particular a tractor, can be a tractor. In operation, both are hydraulic systems 100 . 200 via a hydraulic line 110 connected to each other, wherein the second hydraulic system 200 active the first hydraulic system 100 with a fluid 12 "provided". The connection of both hydraulic systems 100 . 200 via a hydraulic line 110 , Unfortunately, it is conceivable that within this hydraulic line 110 Such an increased overpressure can occur, which can be caused for example by sunlight, so that it is extremely difficult for the user, this pressurized hydraulic line 110 with the second hydraulic system 200 directly to pair. This is due to the fact that the hydraulic line 110 with a system connector 120 and a system valve 121 is formed, this system valve 121 because of inside the hydraulic line 110 prevailing overpressure in a closed state 6 located.

The system connector 120 has a chamber 122 on, wherein also a spring element 123 inside the chamber 122 is arranged, which according to 3 . 5 and 11 on the system valve 121 suppressed. Inside the chamber 122 is the fluid 12 , which has an increased pressure. This increased pressure causes the system plugs under "normal" power loads 120 For example, in an adequate system sleeve 220 of the second hydraulic system 200 can not be coupled. The use of these couplings according to the invention helps the user that the pressure in the hydraulic line 110 is relaxed, so that then the hydraulic line 110 without significant effort with your system plug 122 at the system socket 220 can be connected, which will be discussed in detail below.

The coupling 10 has a plug part 20 and a sleeve part 40 on. According to the embodiments in 3 and 5 has the plug part 20 a linearly displaceable mounted plug valve 21 on, wherein a spring element 23 such the plug valve 21 in the direction of the second hydraulic system 200 pushes that the plug valve 21 in the uncoupled state with the system 200 in closed condition 4 remains. The spring element 23 is in a chamber 22 of the plug part 20 , If the plug part 20 with a socket part 220 of the system 200 is coupled (see 5 ) is the plug part 20 in the open state 3 , regardless of whether pressurization of the system 200 on the clutch 10 was introduced.

The socket part 40 however, with a sleeve valve 41 designed according to 1 and 11 because of one inside a chamber 42 acting spring element 43 in a closed state 2 located. If now according to 3 . 5 or 11 the system connector 120 in the socket part 40 is plugged in, pushes the system valve 121 the sleeve valve 41 in the open state 1 who in 3 or in 11 is shown. Due to the effective overpressure in the hydraulic line 110 the system valve remains 120 in its closed state 6 ,

After the plug part 20 also with the second hydraulic system 200 can be coupled, via an increase in pressure, starting from the second hydraulic system 200 such a high pressure in the chamber 42 of the sleeve part 40 be created, so according to 4 and 5 the system valve 121 from his closed state 6 in the open state 5 is transferred. As well in 3 as well as in 4 . 5 and 11 is the system valve 121 directly in contact with the socket valve 41 , Due to the pressure increase fluid flows 12 from the second hydraulic system 200 along a flow path into the chamber 42 of the sleeve part 40 which is indicated by the arrows schematically shown in FIG 5 is shown. As both valves 41 . 121 are opened, there is a pressure equalization in the chambers 42 . 122 one. According to 5 the fluid flows 12 from the hydraulic system 200 through the open plug valve 21 in the chamber 42 of the sleeve part 40 , In 11 is the plug part 20 with a hose or pipe of the second hydraulic system 200 connected so that the fluid 12 via a pressure increase as per 3 and 5 in the chamber 42 can flow. The special feature of the embodiment according to 11 is that this clutch 10 serves as a stationary solution, which means that after the pressure release in the line 110 the coupling 10 between both hydraulic systems 100 . 200 can remain connected and a supply of the first hydraulic system 100 through the second hydraulic system 200 with the fluid 12 can be done.

Within the flow path of the fluid 12 there is an actuator 60 , which in the pressure increase the fluid 12 a flow area 62 offers. In the embodiment according to 2 has the actuator 60 in the middle a recess 61 on, through which the fluid 12 at pressure increase in the direction of the sleeve part 40 can flow. This recess 61 is as a hole or opening 61 educated. The recess 61 defined according to 2 the flow area 62 through which the fluid 12 in the direction of the sleeve part 40 can flow. Now takes place a pressure reduction, starting from the second hydraulic system 200 , the fluid can 12 , which in overpressure in the hydraulic line 110 , as well as in the chambers 42 . 122 is located, only over the small recess 61 of the actuating element 60 in the direction of the second hydraulic system 200 escape. As both spring elements 43 . 123 an equally large force each on her valve 121 . 41 exercise, the overpressure in the hydraulic line 110 are completely degraded, in which the fluid 12 through the recess 61 in the direction of the second hydraulic system 200 flows without both valves 41 . 121 their position according to 4 to lose. This means that in the fully pressureless state of the hydraulic line 110 the sleeve valve 41 as well as the system valve 121 her open state 1 . 5 keep that in 4 is shown. Subsequently, the clutch 10 from the overall system 80 be removed. The hydraulic line 110 can be connected directly to the system socket without effort 220 of the second hydraulic system 200 be plugged in.

According to 5 and 11 has the actuator 60 a further embodiment, which is described in the following: The actuator 60 has as in the embodiment according to 3 and 2 in the middle a recess 61 on, the flow cross section 62 for the fluid 12 Are defined. In addition, the actuator element 60 areas 66 on, the flow cross section 62 for the fluid 12 at pressure increase starting from the second hydraulic system 200 increase significantly. As 6 and 8th can clarify when pressure is increased, the fluid 12 both through the recess 61 as well as through the open spaces 66 in the direction of the sleeve part 40 stream. This is the actuator 60 with his foot area 67 on a housing wall 13 at, where at the same time the actuator 60 an end face 65 that points to an adjacent housing wall 14 is spaced. According to 5 . 6 and 11 is the actuator 60 in a first workspace 63 , Due to the increase in pressure exerts the fluid 12 on the face 65 such a force, so that the actuator 60 with his foot area 67 contacting the housing wall 13 remains. When lowering the pressure exerts the fluid 12 on the inner wall 68 of the actuating element 60 a force, so that the actuator 60 in the second workspace 64 according to 7 moves. In the second workspace 64 lies the face 65 directly on the housing wall 14 on, so As a result, the flow area 62 for the fluid 12 is significantly reduced. The fluid 12 is only the flow area 62 available through the recess 61 is defined. The open spaces 66 provide the fluid 12 no way in the direction of the second hydraulic system 200 to flow as the face 65 sealing on the housing wall 65 is present and only a flow path of the fluid 12 through the recess 61 is possible. By this embodiment, the purpose is that quickly a pressure increase in the sleeve part 40 can be achieved, both valves 41 . 121 in their open state 40 . 120 be located or brought. So that both valves 41 . 121 in the floating state according to 4 respectively. 5 remain while a pressure reduction is initiated from the second hydraulic system, it is necessary that the flow area at the actuator 60 for the fluid 12 is low.

According to the embodiment according to 2 can the actuator 60 two workspaces 63 . 64 take, where in 2 the first workspace 63 is shown, which occurs when the pressure increases. When lowering the pressure, the actuator moves 60 in the direction of the second hydraulic system, the end face 65 on the housing wall 14 is applied. In this embodiment, the flow area for the fluid at pressure reduction and pressure increase is the same size.

Another embodiment is in 9 and 10 shown, wherein the recess 61 of the actuating element 60 in the form of a groove 61 is formed along the side of the actuating element 60 runs, which is the second hydraulic system 200 is facing. The groove 61 poses for the fluid 12 a flow path towards the open space 66 When pressure is increased, the actuator is located 60 in a first workspace 63 who in 6 is shown. That means the fluid 12 through the three open spaces 66 as well as along the groove 61 in the direction of the sleeve part 40 can flow. When lowering the pressure, the actuator shifts 60 in a position that is in 7 is shown. The fluid 12 presses on the inner wall 68 of the actuating element 60 so the open spaces 66 through the on the housing wall 14 adjacent face 65 are sealed so that only the fluid 12 along the groove 61 from the socket part 40 in the direction of the second hydraulic system 200 can flow. Also in this embodiment, a fast pressure levels and a slow pressure sinks by the actuator according to the invention 60 achieved.

The opening 61 according to 2 and 8th can have any geometric shapes, such as round, oval, angular, etc. It is also conceivable that several recesses 61 in the actuator 60 are provided.

The geometric shape of the groove 61 according to the embodiment of 9 can be angular, round, oval, etc. A particular advantage of the embodiment of the actuating element 60 with the groove according to 9 is that clogging the groove 61 due to contamination in the fluid 12 less common than opening 61 according to 2 or 8th , Also, the embodiment according to 9 can be further developed such that a plurality of grooves 61 , For example, two or three are provided, which the flow area 62 for the fluid 12 define.

As in 4 is shown is a stop 44 in the socket part 40 as well as a stop 124 in the system connector 120 intended. The attacks 44 . 124 serve to keep the valves 41 . 121 are limited in their movement.

As in 1 . 3 and 5 is shown has the coupling 10 two covers 15a and 15b on, the outside of each other on the housing 11 are arranged. In the present embodiments, the covers are 15a and 15b via a locking connection on the housing 11 attached. The covers 15a and 15b have markings on the outside, clearly visible to the user. The markers serve as a guide to the user, and how around the clutch 10 to the first and the second hydraulic system 100 . 200 to be stuck. For example, it is conceivable that the marking of the cover 15a the sign "+" bears and the marking of the cover 15b "-" wearing.

The covers 15a . 15b can also in the embodiment according to 11 be attached. In addition, the embodiments are according to 2 . 6 . 8th to 10 with respect to the actuating element 60 to the embodiment 11 transferable. Furthermore, the operation of the clutch corresponds 10 essentially according to the statements 1 to 10 , The only difference is that the plug part 20 without plug valve 21 gets along.

LIST OF REFERENCE NUMBERS

1

opened state of 40

2

closed state of 40

3

opened state of 20

4

closed state of 20

5

opened state of 120

6

closed state of 120

10

clutch

11

casing

12

fluid

13

housing

14

housing

15a

Cover, marking

15b

Cover, marking

20

plug part

21

plug valve

22

chamber

23

spring element

40

female member

41

sleeve valve

42

chamber

43

spring element

44

attack

60

actuator

61

Recess, opening, groove

62

flow cross-section

63

first work area with pressure increase

64

second working area with pressure reduction

65

face

66

open space

67

footer

68

inner wall

80

system

100

first hydraulic system

110

hydraulic line

120

system connector

121

system valve

122

chamber

123

spring element

124

attack

200

second hydraulic system

220

System sleeve, socket part

Claims (21)

Clutch ( 10 ) for connection to a fluid ( 12 ) pressurized hydraulic line ( 110 ) of a first hydraulic system ( 100 ) with a second hydraulic system ( 200 ), with a plug part ( 20 ) connected to the second hydraulic system ( 200 ) is connectable, one a sleeve valve ( 41 ) having a socket part ( 40 ) into which a system plug ( 120 ) with a closed system valve ( 121 ) of the hydraulic line ( 110 ) can be inserted, wherein an actuating element formed in this way ( 60 ) in a housing ( 11 ) of the coupling ( 10 ) is provided that when a coupling of the system plug ( 120 ) with the sleeve part ( 40 ) the socket valve ( 41 ) in an open state ( 1 ), whereby the system valve ( 121 ) in a closed state ( 6 ), characterized in that the actuating element ( 60 ) one from the second hydraulic system ( 200 ) outgoing pressure increase in the socket part ( 40 ), whereby a fluid ( 12 ) from the second hydraulic system ( 200 ) in the socket part ( 40 ) and the system valve ( 121 ) of the hydraulic line ( 110 ) in an open state ( 5 ) can be brought, wherein the sleeve valve ( 41 ) in the opened state ( 1 ) and that at a subsequent from the second hydraulic system ( 200 ) outgoing pressure reduction the sleeve valve ( 41 ) and the system valve ( 121 ) unchanged in the open state ( 1 . 5 ), the fluid ( 12 ) in the direction of the second hydraulic system ( 200 ) can be flowed back until the hydraulic line ( 110 ) of the first hydraulic system ( 100 ) is depressurized, wherein the actuating element ( 60 ) at least one recess ( 61 ), by which the fluid (when pressure increase) 12 ) from the second hydraulic system ( 200 ) to the sleeve part ( 40 ) and / or when reducing the pressure the fluid ( 12 ) from the socket part ( 40 ) to the second hydraulic system ( 200 ) is flowable, and wherein the recess ( 61 ) is designed geometrically such that when pressure is reduced in the second hydraulic system ( 200 ) a fluid return in the direction of the second hydraulic system ( 200 ) is provided, in which the sleeve valve ( 41 ) and the system valve ( 121 ) in the open state ( 1 . 5 ) remain. Clutch ( 10 ) according to claim 1, characterized in that the sleeve part ( 40 ) a chamber ( 42 ), in which the sleeve valve ( 41 ) is movably mounted, with one within the chamber ( 42 ) arranged spring element ( 43 ) on the socket valve ( 41 ) acts. Clutch ( 10 ) according to claim 1 or 2, characterized in that the plug part ( 20 ) and the sleeve part ( 40 ) form a common component. Clutch ( 10 ) according to claim 1, characterized in that the recess ( 61 ) an opening ( 61 ), which has a cross-sectional diameter which is between 0.5 mm and 1.2 mm, in particular between 0.6 mm and 0.9 mm, more preferably is 0.6 mm. Clutch ( 10 ) according to claim 1, characterized in that the recess ( 61 ) a groove ( 61 ), in particular on the side of the actuating element ( 60 ) is arranged, which the second hydraulic system ( 200 ) is facing. Clutch ( 10 ) according to one of the preceding claims, characterized in that the housing ( 11 ) is designed such that the actuating element ( 60 ) is interchangeable. Clutch ( 10 ) according to one of the preceding claims, characterized in that on the actuating element ( 60 ) a flow area ( 62 ) for the fluid ( 12 ) is present at pressure increase and pressure reduction, wherein the flow cross-section ( 62 ) at least through the recess ( 61 ) is formed. Clutch ( 10 ) according to claim 7, characterized in that the actuating element ( 60 ) is designed such that at pressure increase and pressure reduction of the flow area ( 62 ) is the same size. Clutch ( 10 ) according to claim 7, characterized in that the actuating element ( 60 ) is designed such that at pressure increase the flow area ( 62 ) is greater than the flow area ( 62 ) with pressure reduction. Clutch ( 10 ) according to one of the preceding claims, characterized in that the actuating element ( 60 ) within the housing ( 11 ) is movably mounted, wherein at pressure increase the actuator ( 60 ) into a first workspace ( 63 ) and when lowering the pressure in a second work area ( 64 ) can be brought. Clutch ( 10 ) according to one of the preceding claims, characterized in that the actuating element ( 60 ) an end face ( 65 ), which at pressure reduction on the housing ( 11 ) and at pressure increase spaced from the housing ( 11 ), so that the flow cross-section ( 62 ) is lower at pressure reduction than at pressure increase. Clutch ( 10 ) according to one of the preceding claims, characterized in that the actuating element ( 60 ) is metallic and / or plate-like. System ( 80 ) to relax one with a fluid ( 12 ) pressurized hydraulic line ( 110 ) of a first hydraulic system ( 100 ) with a coupling ( 10 ), which is the first hydraulic system ( 100 ) with a second hydraulic system ( 200 ), whereby the coupling ( 10 ) a plug part ( 20 ) connected to the second hydraulic system ( 200 ) and one with a sleeve valve ( 41 ) formed sleeve part ( 40 ) into which a system plug ( 120 ) with a closed system valve ( 121 ) of the hydraulic line ( 110 ) can be coupled, wherein in the housing ( 11 ) of the coupling ( 10 ) an actuating element formed in this way ( 60 ) is arranged such that when a coupling of the system plug ( 120 ) with the sleeve part ( 40 ) the socket valve ( 41 ) in an open state ( 1 ), whereby the system valve ( 121 ) in a closed state ( 6 ), characterized in that the actuating element ( 60 ) one from the second hydraulic system ( 200 ) outgoing pressure increase in the socket part ( 40 ), whereby a fluid ( 12 ) from the second hydraulic system ( 200 ) in the socket part ( 40 ) and the system valve ( 121 ) of the hydraulic line ( 110 ) in an open state ( 5 ) can be brought, wherein the sleeve valve ( 41 ) in the opened state ( 1 ) and that at a subsequent from the second hydraulic system ( 200 ) outgoing pressure reduction the sleeve valve ( 41 ) and the system valve ( 121 ) unchanged in the open state ( 1 . 5 ), the fluid ( 12 ) in the direction of the second hydraulic system ( 200 ) can be flowed back until the hydraulic line ( 110 ) of the first hydraulic system ( 100 ) is depressurized, wherein the actuating element ( 60 ) at least one recess ( 61 ), by which the fluid (when pressure increase) 12 ) from the second hydraulic system ( 200 ) to the sleeve part ( 40 ) and / or when reducing the pressure the fluid ( 12 ) from the socket part ( 40 ) to the second hydraulic system ( 200 ) is flowable, and wherein the recess ( 61 ) is designed geometrically such that when pressure is reduced in the second hydraulic system ( 200 ) a fluid return in the direction of the second hydraulic system ( 200 ) is provided, in which the sleeve valve ( 41 ) and the system valve ( 121 ) in the open state ( 1 . 5 ) remain. System ( 80 ) according to claim 13, characterized in that the sleeve part ( 40 ) a chamber ( 42 ), in which the sleeve valve ( 41 ) is movably mounted, with one within the chamber ( 42 ) arranged spring element ( 43 ) on the socket valve ( 41 ), whereby the system plug ( 120 ) a chamber ( 122 ), in which the system valve ( 121 ) is movably mounted, with one within the chamber ( 122 ) of the system connector ( 120 ) arranged spring element ( 123 ) on the system valve ( 121 ) acts, wherein the spring force of the spring element ( 43 ) of the sleeve part ( 40 ) equal to the spring force of the spring element ( 123 ) of the system connector ( 120 ), whereby, after the pressure increase, a floating position of the system valve ( 121 ) and the sleeve valve ( 41 ), at which the system valve ( 121 ) and the sleeve valve ( 41 ) remain open and an equal pressure in the chamber ( 122 ) of the system connector ( 120 ) and in the chamber ( 42 ) of the sleeve part ( 40 ). System ( 80 ) according to claim 14, characterized in that after the pressure lowering the floating position remains. System ( 80 ) according to claim 13 or 14, characterized in that the first hydraulic system ( 100 ) is an agricultural machine to be pulled and the second hydraulic system ( 200 ) is a towing agricultural machine, in particular a tractor. Process for relaxing one with a fluid ( 12 ) pressurized hydraulic line ( 110 ) of a first hydraulic system ( 100 ) with a coupling ( 10 ), which is the first hydraulic system ( 100 ) with a second hydraulic system ( 200 ), whereby the coupling ( 10 ) a plug part ( 20 ) connected to the second hydraulic system ( 200 ) and one with a sleeve valve ( 41 ) formed sleeve part ( 40 ) into which a system plug ( 120 ) with a closed system valve ( 121 ) of the hydraulic line ( 110 ) can be coupled, wherein in the housing ( 11 ) of the coupling ( 10 ) an actuating element formed in this way ( 60 ) is arranged such that when a coupling of the system plug ( 120 ) with the sleeve part ( 40 ) the socket valve ( 41 ) in an open state ( 1 ), the system valve ( 121 ) in a closed state ( 6 ), characterized in that the actuating element ( 60 ) one from the second hydraulic system ( 200 ) outgoing pressure increase in the socket part ( 40 ), whereby a fluid ( 12 ) from the second hydraulic system ( 200 ) in the socket part ( 40 ) flows and the system valve ( 121 ) of the hydraulic line ( 110 ) in an open state ( 5 ), wherein the sleeve valve ( 41 ) in the opened state ( 1 ) and that at a subsequent from the second hydraulic system ( 200 ) outgoing pressure reduction the sleeve valve ( 41 ) and the system valve ( 121 ) unchanged in the open state ( 1 . 5 ), the fluid ( 12 ) in the direction of the second hydraulic system ( 200 ) flows back until the hydraulic line ( 110 ) of the first hydraulic system ( 100 ) is depressurized, wherein the actuating element ( 60 ) at least one recess ( 61 ), by which the fluid (when pressure increase) 12 ) from the second hydraulic system ( 200 ) to the sleeve part ( 40 ) and / or when reducing the pressure the fluid ( 12 ) from the socket part ( 40 ) to the second hydraulic system ( 200 ) is flowable, and wherein the recess ( 61 ) is designed geometrically such that when pressure is reduced in the second hydraulic system ( 200 ) a fluid return in the direction of the second hydraulic system ( 200 ) is provided, in which the sleeve valve ( 41 ) and the system valve ( 121 ) in the open state ( 1 . 5 ) remain. Method according to claim 17, characterized in that the coupling ( 10 ) of both hydraulic systems ( 100 . 200 ) and the system connector ( 120 ) of the hydraulic line ( 110 ) to the system socket ( 220 ) of the second hydraulic system ( 200 ) is connected. Method according to claim 17 or 18, characterized in that, when the pressure is increased, the fluid ( 12 ) into a chamber ( 22 ) of the plug part ( 20 ) and then through the coupling ( 10 ) to the Chamber ( 42 ) of the sleeve part ( 40 ) flows. System ( 80 ) according to claim 13 to 16 with a coupling ( 10 ) according to claims 1 to 12. Method according to Claims 17 to 19 for operating a system ( 80 ) according to claims 13 to 16 and claim 20.

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