Coupling device for producing a non-permanent hydraulic connection

1 . A tool holder comprising a housing, a spindle, a centering receptacle arranged in the spindle for receiving an adapter, and a clamping system actuated by a fluid for clamping and detaching the adapter in the centering receptacle, wherein at least one first coupling part is present in the spindle,

wherein at least one second coupling part is present in the housing,

wherein the first coupling part and the second coupling part are suitable for working together to form a coupling device for a fluid,

wherein the first coupling part is formed as a spring-loaded, double check valve,

wherein the second coupling part comprises an actuator piston guided displaceably in the housing, and

wherein an outwardly opening directional valve is arranged in the actuator piston, characterized in that

the actuator piston divides a cylinder bore into a first cylinder chamber and a second cylinder chamber.

2 . The tool holder according to claim 1 , characterized in that each first coupling part has a shoulder on its end facing the second coupling part, which dips into a guide bore of the second coupling part when the coupling device is closed, wherein the fluid chamber of the second coupling part opens into the guide bore, wherein a sleeve-shaped valve seat of the directional valve is accommodated displaceably in the guide bore, and wherein a valve tappet of the directional valve is connected to the actuator piston and projects through the sleeve-shaped valve seat.

3 . The tool holder according to claim 1 , characterized in that the check valves of the first coupling parts are arranged radially relative to the axis of the centering receptacle.

4 . The tool holder according to claim 1 , comprising two of the second coupling parts, and also a first fluid line and a second fluid line, characterized in that each second coupling part comprises a first control line and a second control line, in that the first control line of the first second coupling part and the second control line of the second coupling part are connected to the first fluid line, and in that the second control line of the first second coupling part and the first control line of the second coupling part are connected to the second fluid line.

5 . The tool holder according to claim 1 , characterized in that the fluidic actuation of the clamping system comprises a single-acting cylinder structure, and in that the first coupling part for the supply of the cylinder structure is provided for clamping and releasing the clamping system.

6 . The tool holder according to any of claim 1 , characterized in that the fluidic actuation of the clamping system comprises a double-acting cylinder structure, and in that two of the first coupling parts for the supply of the connections of the cylinder structure are provided for clamping and releasing the clamping system.

7 . A tool holder comprising a housing, a spindle, a centering receptacle arranged in the spindle for receiving an adapter, and a clamping system actuated by a fluid for clamping and detaching the adapter in the centering receptacle,

wherein at least one first coupling part is present in the spindle,

wherein at least one second coupling part is present in the housing,

wherein the at least one first coupling part and the at least one second coupling part are suitable for working together to form a coupling device for a fluid,

wherein the at least one first coupling part is formed as a spring-loaded, double check valve,

wherein the at least one second coupling part comprises an actuator piston guided displaceably in the housing, and

wherein an outwardly opening directional valve is arranged in the actuator piston, characterized in that

the actuator piston is designed as a stepped piston,

in that a first part of the actuator piston delimits a first cylinder chamber

in that a second part of the actuator piston delimits a second cylinder chamber, and

in that a diameter of the first part of the actuator piston is smaller than a diameter of the second part of the actuator piston, such that a third cylinder chamber with an annular surface is present at the transition between the first part and the second part of the actuator piston.

8 . A tool holder comprising a housing, a spindle, a centering receptacle arranged in the spindle for receiving an adapter, and a clamping system actuated by a fluid for clamping and detaching the adapter in the centering receptacle,

wherein at least one first coupling part is present in the spindle,

wherein at least one second coupling part is present in the housing,

wherein the first coupling part and the second coupling part are suitable for working together to form a coupling device for a fluid,

wherein the first coupling part is designed as a spring-loaded, double check valve, wherein the second coupling part comprises an actuator piston guided displaceably in the housing, wherein an outwardly opening directional valve is arranged in the actuator piston,

characterized in that the first coupling part has a shoulder on an end of the first coupling part, the shoulder facing the second coupling part, which dips into a guide bore of the second coupling part when the coupling device is closed, wherein a fluid chamber of the second coupling part opens into the guide bore, wherein a sleeve-shaped valve seat of the directional valve is accommodated displaceably in the guide bore, and wherein a valve tappet of the directional valve is connected to the actuator piston and projects through the sleeve-shaped valve seat of the directional valve.

9 . A supply bracket comprising at least one second coupling part which is suitable for working together with a first coupling part to form a coupling device for a fluid,

wherein the first coupling part is formed as a spring-loaded, double check valve,

wherein the second coupling part comprises an actuator piston guided displaceably in a housing,

wherein an outwardly opening directional valve is arranged in the actuator piston,

wherein the actuator piston divides a cylinder bore into a first cylinder chamber and a second cylinder chamber,

wherein the supply bracket comprises a C-shaped docking portion, and

wherein at least two of the second coupling parts are arranged on the docking portion.

10 . The supply bracket according to claim 9 , characterized in that each second coupling part is compatible with the first coupling part of a tool holder comprising the housing, a spindle, a centering receptacle arranged in the spindle for receiving an adapter, and a clamping system actuated by a fluid for clamping and detaching the adapter in the centering receptacle, wherein at least one further first coupling part is present in the spindle,

wherein the at least one second coupling part is present in the housing,

wherein the first coupling part and the second coupling part are suitable for working together to form the coupling device for the fluid,

wherein the first coupling part is formed as the spring-loaded, double check valve,

wherein the second coupling part comprises an actuator piston guided displaceably in the housing, and

wherein the outwardly opening directional valve is arranged in the actuator piston,

characterized in that the actuator piston divides the cylinder bore into a first cylinder chamber and the second cylinder chamber.

11 . The supply bracket according to claim 9 , characterized in that the supply bracket comprises two of the second coupling parts, and also a first fluid line and a second fluid line, in that each second coupling part comprises a first control line and a second control line, in that the first control line of the first second coupling part and the second control line of the second coupling part are connected to the first fluid line, and in that the second control line of the first second coupling part and the first control line of the second coupling part are connected to the second fluid line.

12 . The supply bracket according to claim 9 , characterized in that the supply bracket comprises at least two of the second coupling parts, and in that each second coupling part is compatible with the first coupling part of a tool holder.

13 . The supply bracket according to claim 12 , characterized in that the at least two second coupling parts are arranged such that the forces exerted by valve tappets of the second coupling parts on the first coupling parts completely or at least largely cancel each other out.

14 . The supply bracket according to claim 9 , characterized in that a clearance between the cylinder bore and the actuator piston on an end of the actuator piston facing away from the first coupling part is smaller than a clearance between the cylinder bore and the actuator piston on the end thereof facing the first coupling part.

15 . The supply bracket according to claim 9 , characterized in that a first seal is provided on the end of the actuator piston facing away from the first coupling part, and a second seal is provided on the end of the actuator piston facing the first coupling part, and in that the second seal is flexible in the radial direction such that the second seal seals the second cylinder chamber even if the actuator piston is tilted or offset relative to the cylinder bore.

16 . The supply bracket according to claim 15 , characterized in that the second seal seals a third cylinder chamber relative to the second cylinder chamber.

17 . The supply bracket according to claim 15 , characterized in that the fluid chamber is fluidically connected to a supply line in the housing or in the supply bracket via a circumferential groove which is present on the outside of the actuator piston, and via at least one radial bore, and is supplied with fluid, at least in the open position of the directional valve.

18 . The supply bracket according to claim 9 , characterized in that a fluid chamber is formed in the actuator piston in such a way that the fluid chamber is closed on one end, in that the fluid chamber opens into a guide bore, in that a sleeve-shaped valve seat of the directional valve is displaceably accommodated in the guide bore, and in that a valve tappet of the directional valve is coupled to the actuator piston and projects through the sleeve-shaped valve seat, such that a valve plate of the valve tappet limits the path of the valve seat in the guide bore.

19 . The supply bracket according to claim 18 , characterized in that the valve seat comprises a sleeve and a seat ring received and guided in the sleeve, and also a spring element, and in that the spring element is supported on one end on the sleeve and on the other end on the seat ring.

20 . The supply bracket according to claim 19 , characterized in that a second compression spring is arranged in the fluid chamber, and in that a spring force exerted by the second compression spring on the valve seat presses the valve seat against the valve plate of the valve tappet.

21 . The supply bracket according to claim 20 , characterized in that a third compression spring is arranged in the second cylinder chamber or outside the housing or the supply bracket, and the spring force thereof on the actuator piston counteracts the pressure forces of a fluid located in the first cylinder chamber or/and a third cylinder chamber.

22 . The supply bracket according to claim 21 , characterized in that the fluid chamber can be supplied with fluid via a supply line or a combined control and supply line at least in the open position of the directional valve.

23 . The supply bracket according to claim 18 , characterized in that a throttle or orifice is present between the fluid chamber and the directional valve, so that, when the directional valve is open, the outflow of pressurized fluid from the fluid chamber is limited and a minimum overpressure in the fluid chamber and in a third cylinder chamber is maintained.

24 . The supply bracket according to claim 23 , characterized in that the throttle is designed as an annular gap between the valve tappet and the valve seat or its sleeve.

25 . The supply bracket according to claim 18 , characterized in that the check valve of the first coupling part comprises a valve housing, in that an opening for the fluid, which is connected to the check valve, is formed on the valve housing, in that the opening is formed in a shoulder of the valve housing, and in that, when the coupling device is closed, a shoulder dips into the guide bore of the second coupling part, and the valve seat of the directional valve lifts off from the valve plate of the valve tappet, and in that a line in the housing or of a spindle is opened or closed by the check valve.

26 . The supply bracket according to claim 25 , characterized in that the shoulder of the valve housing is designed to be frustoconical or dome-shaped.

27 . The supply bracket according to claim 9 , characterized in that the first cylinder chamber can be supplied with fluid via a first control line.

28 . The supply bracket according to claim 9 , characterized in that the second cylinder chamber can be supplied with fluid via a second control line.

29 . The supply bracket according to claim 9 , characterized in that the actuator piston comprises a first portion and a second portion, and the cylinder bore comprises a first portion and a second portion, characterized in that at least the second portion of the actuator piston has an oval or elliptical cross-section, and in that at least the second portion of the cylinder bore has an oval or elliptical cross-section.

30 . The supply bracket according to claim 9 , characterized in that the actuator piston has a cone or an inner dome on its end facing the first coupling part, and in that the first coupling part has a shoulder on its end facing the second coupling part.

31 . A supply bracket comprising at least one second coupling part which is suitable for working together with a first coupling part to form a coupling device for a fluid,

wherein the first coupling part is formed as a spring-loaded, double check valve,

wherein the at least one second coupling part comprises an actuator piston guided displaceably in a housing, and

wherein an outwardly opening directional valve is arranged in the actuator piston,

wherein the actuator piston is designed as a stepped piston,

wherein a first part of the actuator piston delimits a first cylinder chamber,

wherein a second part of the actuator piston delimits a second cylinder chamber, and

in that a diameter of the first part of the actuator piston is smaller than a diameter of the second part of the actuator piston, such that a third cylinder chamber with an annular surface is present at the transition between the first part and the second part of the actuator piston,

wherein the supply bracket comprises a C-shaped docking portion, and

wherein at least two of the second coupling parts are arranged on the docking portion.

32 . The supply bracket according to claim 31 , characterized in that the third cylinder chamber and a fluid chamber are simultaneously supplied with fluid via the control and supply line.

33 . A rotary machine, comprising at least one tool holder comprising a housing, a spindle, a centering receptacle arranged in the spindle for receiving an adapter, and a clamping system actuated by a fluid for clamping and detaching the adapter in the centering receptacle, wherein at least one first coupling part is present in the spindle,

wherein at least one second coupling part is present in the housing,

wherein the first coupling part and the second coupling part are suitable for working together to form a coupling device for a fluid,

wherein the first coupling part is formed as a spring-loaded, double check valve,

wherein the second coupling part comprises an actuator piston guided displaceably in the housing, and

wherein an outwardly opening directional valve is arranged in the actuator piston,

wherein the actuator piston divides a cylinder bore into a first cylinder chamber and a second cylinder chamber in that the fluidic actuation of the clamping system comprises a cylinder structure, and in that the at least one first coupling part for the supply of the cylinder structure is provided for clamping and releasing the clamping system.

34 . The rotary machine according to claim 33 , characterized in that the rotary machine is equipped with a supply bracket comprising the at least one second coupling part which is suitable for working together with the first coupling part to form the coupling device for the fluid,

wherein the first coupling part is formed as the spring-loaded, double check valve,

wherein the at least one second coupling part comprises the actuator piston guided displaceably in the housing,

wherein the outwardly opening directional valve is arranged in the actuator piston,

wherein the actuator piston divides the cylinder bore into the first cylinder chamber and the second cylinder chamber,

wherein the supply bracket comprises a C-shaped docking portion, and

wherein at least two of the second coupling parts are arranged on the docking portion.