DE102011111533B4 - Pressure generator for a pulling or pressing device and pulling or pressing device - Google Patents

Abstract

Pressure generator (1) for a hydraulic tool, in particular for a pulling and / or pressing device, comprising a pneumatic piston (13) which is coupled to a hydraulic piston (18), the pneumatic piston (13) being able to be oscillated by means of a control device, so that a pressure can be generated by oscillating movement of the hydraulic piston (18) in a hydraulic area (20), and wherein the hydraulic area (20) has a quick coupling (8) with a hydraulic line for a hydraulic tool, the hydraulic area (20) having a relief valve ( 21), which can be actuated with the control device and / or with an actuating device (2), such that the relief valve (21) opens in a non-actuated position, characterized in that the relief valve (21) is equipped with a safety actuation device (7) is connected, which must be actuated in order to use the actuating device (2) pressure in the hydraulic region (20) z generate u.

Description

Field of the Invention

The invention relates to a pressure generator for tool applications that have to generate high forces by means of hydraulic active elements, such as a pulling or pressing device. In particular, the invention relates to a pressure generator designed as a hand-held device, which can be coupled to different riveting tool adapters.

Background of the Invention

Hydraulically operated setting tools are known. These are, for example, riveting devices with a pressing device for riveting conventional rivets. There are also riveting tools with a pulling device for setting blind rivets, blind rivet nuts etc.

Compressed air operated hand riveters are known in practice. These usually have a pneumatic piston which is coupled to a hydraulic piston. Using the ratio of pneumatic pistons to hydraulic pistons, a higher pressure can be generated in the hydraulic area than is applied in the pneumatic area of the device via the compressed air connection. Nevertheless, the pulling force of known hand-held riveting tools is limited and in many cases is not enough to process even high-strength rivets of the newer type. In addition, operated hand-held riveting devices known from practice are generally rather unwieldy, so that it is often not possible to reach places that are difficult to access, for example between the body profiles of a vehicle.

Also known from practice are riveting devices which are connected by a high-pressure hydraulic hose to a stationary pressure generator. With such riveting tools, the actual riveting tool is often more manageable. However, such a device is complex and, in particular, it is difficult to replace one hydraulic riveting device connected to the stationary pressure generator with another.

The document EP 1 423 614 B1 shows a pressure translator.

The document DE 10 2010 000 545 A1 relates to a hydraulic pressing device for the radial pressing of workpieces such as fittings on pipes.

The document JP H11-245 177 A. shows a hydropneumatic tool.

The document EP 0 117 243 B1 also shows a hand-operated pneumatic hydraulic tool.

The document EP 0 999 906 B1 shows a pneumatic-hydraulic riveting tool.

The document US 2 807 021 A. shows an air motor.

Object of the invention

The invention is based on the object of reducing the disadvantages of the prior art.

It is in particular an object of the invention to provide an easy-to-use pressure generator, by means of which a hydraulic pulling or pressing device, in particular a riveting device, can be actuated, a high tensile force or compressive force being able to be achieved due to a high pressure.

Summary of the invention

The object of the invention is already achieved by a pressure generator for a hydraulic tool, in particular for a pulling and / or pressing device according to one of the independent claims.

Preferred forms of training and further education can be found in the respective subclaims.

The invention relates to a pressure generator for a hydraulic tool. It is a hydraulically actuated device which can be used, for example, to pull on a component or to exert pressure on a component.

In particular, the invention relates to all types of riveting devices such as, for example, for conventional rivets which are pressed together with a pressing device and for blind rivets which, when processed, are pulled on a pin by means of a pulling device until the pin breaks off after a rivet has been formed. Blind rivets can also be set with a suitable adapter.

However, the hydraulic pressure generator according to the invention can also be used for other hydraulically operated tools such as spreading devices, cartridges for pressing out adhesive or sealant, for pliers, in particular for separating cables, etc.

The pressure generator comprises a pneumatic piston which can be actuated via compressed air.

The pneumatic piston is coupled to a hydraulic piston. The achievable pressure in the hydraulic area is determined via the transmission ratio between hydraulic pistons and pneumatic pistons.

The gear ratio is preferably more than 1:50, in particular a gear ratio of 1: 100 is provided. The gear ratio can be up to 1: 150. With an applied air pressure of 8 bar, a pressure of 800 bar can be generated in the hydraulic area.

The pneumatic piston can be moved in an oscillating manner by means of a control device such that a pressure can be generated in the hydraulic region by oscillating movement of the hydraulic piston. The pressure generator thus works as a hydraulic pump, which makes it possible that despite the small working space of the hydraulic piston due to the high transmission ratio, a sufficient amount of hydraulic fluid can also be made available in order to move pulling or pressing devices at an appropriate speed.

The hydraulic area also includes a quick coupling with a hydraulic line for a pulling or pressing device. The pressure generator is therefore decoupled from the actual pulling or pressing device. This can be connected to the hydraulic area by means of a quick coupling. A particularly simple exchange of the respective tool is thus possible. A rigid mechanical connection is preferably also provided by the quick coupling.

The pressure generator and the pulling or pressing device can thus be used as a hand-held device.

In an alternative embodiment of the invention, however, it is also conceivable to operate the pressure generator stationary, that is to say the pulling or pressing device is connected to a pulling or pressing device via a hydraulic line which has a quick coupling.

In a development of the invention, the control device comprises a piston control.

In particular, a pilot control valve is used, which can be actuated via the pneumatic piston, in particular can be moved into a closed position.

In contrast to known slot controls or reversing devices integrated in the pneumatic pistons, a relatively large stroke can be achieved in this way. Furthermore, the weight of the pneumatic piston is reduced and its reliability is increased compared to reversing devices integrated in the piston.

A part of the pilot control valve preferably projects into the working space of the pneumatic piston. When the piston is reset, the piston crown rests on the pilot control valve and closes it. As a result, pressure can build up in the working area of the pneumatic piston, which pushes the piston forward.

When driving over a control bore, air flows from the work space to the pilot control valve and opens it, whereby the compressed air in the work space of the pneumatic piston is released and the piston, which works, for example, against a spring, is reset until it again closes the pilot control valve.

The stroke of the pneumatic piston is preferably between 5 and 20 mm. Furthermore, the piston preferably operates at a frequency of 5 and 20 Hz.

According to one aspect of the invention, the hydraulic area has a relief valve. This relief valve serves for the backflow of the hydraulic fluid in an unactuated state.

Furthermore, the relief valve, which is preferably designed as a three / two-way valve, can also perform safety-related functions. According to one aspect of the invention, it is provided that the relief valve must be closed by means of an actuating device before each actuation of the pressure generator in order to be able to build up pressure.

This means that only two-hand operation of the tool is possible. For this purpose, the relief valve is controlled via an actuating device of the pressure generator in such a way that it is opened immediately when the actuating device is released. When the actuating device is released, it is ensured that the hydraulic area is immediately depressurized.

In a preferred embodiment of the invention, a hydraulic fluid reservoir is arranged in a chamber, which extends at least partially around the hydraulic area. In particular, an elastomer membrane can be used as the chamber. This embodiment of the invention enables the volume around the substantially smaller hydraulic piston to be used for the storage of hydraulic fluid and thus enables a more compact design of the tool.

In a further preferred embodiment of the invention, the quick coupling has a self-closing valve for hydraulic fluid.

Both the pressure generator and the pulling or pressing device connected to the pressure generator preferably have a self-closing valve. The two components of the tool can thus be connected to one another in a simple manner and a hydraulic connection is created between the two components.

An actuating device is preferably attached to the pressure generator itself in order to actuate the pulling or pressing device. The pressure generator can thus be used as a handheld device and forms a unit with the attached pulling or pressing device.

The invention further relates to a pressure generator for a pulling and / or pressing device, which comprises an oscillatingly movable pneumatic piston, via which a hydraulic piston connected to the pneumatic piston is moved in an oscillating manner and thus generates a high pressure in a hydraulic area as a hydraulic pump.

According to the invention, a pilot control valve can be actuated in a working space of the pneumatic piston by resetting the pneumatic piston, in particular can be moved into a closed position.

For this purpose, at least part of the pilot control valve extends into the working space of the pneumatic piston, or it is also conceivable that the pneumatic piston has an extension, approximately in the form of a mandrel, in order to actuate the pilot control valve arranged in a recess.

As already described above, this type of reversal provides a reliable reversal with a high possible stroke.

The invention further relates to a pulling or pressing tool, in particular in the form of a riveting tool, punching tool or cartridge press, which comprises at least one hydraulic region which can be connected to a pressure generator described above by means of a quick coupling.

The hydraulic area comprises a hydraulic piston with which the pulling or pressing tool is actuated.

To achieve a high tensile force or a high force during pressing, this hydraulic piston in turn has a larger diameter than the hydraulic piston, which builds up the pressure in the pressure generator for actuating the tool.

With such a pulling or pressing device, it is possible to generate forces of more than 100 kN. The quick coupling provides a multifunctional tool.

The invention therefore provides a tool system with a pressure generator as described above, which comprises a plurality of different pulling and / or pressing devices which can be connected to the pressure generator by means of a quick coupling.

Figure list

• 1 zeigt eine perspektivische Ansicht eines Druckerzeugers 1.

The invention is to be referred to in the following with reference to the drawings 1 to 16 are explained in more detail using schematically illustrated exemplary embodiments.

• 1 shows a perspective view of a pressure generator 1 .

The pressure generator 1 includes a housing 5 , which is formed in three parts in this embodiment and comprises a head piece, a middle part and an end piece.

At the end of the housing 5 is an actuator 2nd attached, via which the pressure generator is started. The actuator 2nd is under one handle 4th arranged.

Behind the actuator 2nd there is a pressure regulator 3rd which can be used to set the pressure in the pneumatic area and thus also the pressure in the hydraulic area. Via a compressed air connection 6 can the pressure generator 1 be connected to compressed air.

At the front of the pressure generator 1 there is a quick coupling 8th , which has a self-closing hydraulic valve in the middle 9 having. By means of the quick coupling 8th can be a pulling or pressing device (not shown) on the pressure generator 1 be attached.

Via the self-closing hydraulic valve 9 In this case, hydraulic fluid can be fed into the pulling or pressing device.

There is a safety actuator on the front part of the housing 7 arranged.

Depending on the design variant, the safety actuation device 7 a device with two-handed operation are provided, such that both the Safety control device 7 as well as the actuator 2nd must be operated to generate pressure.

In an alternative embodiment, the safety actuator 7 before actuating the actuating device 2nd are moved to the active position shown here. After the actuation device at the end of a riveting process 2nd the safety control device works 7 forward and the next pulling or pressing process can only be carried out again when the safety control device 7 is folded back into the position shown here.

On the side is in the housing 5 another screw 10 , can be opened above the hydraulic area and hydraulic fluid can be refilled.

2nd shows a sectional view of the in 1 shown pressure generator 1 , on the basis of which the function of the pressure generator is to be explained in more detail.

Via the compressed air connection 6 the pneumatic area, i.e. the area in which compressed air is located in the device, is connected to a compressed air source, such as a compressor.

The pressure regulator 3rd is designed as a so-called upstream pressure regulator. The valve seat 63 is via a screw drive of the printer controller 3rd set in its position. The piston biased downwards by means of a spring 64 is flowed through by compressed air in the middle. By adjusting the valve seat 63 the spring force and thus the set working pressure change. Via the flow control valve 61 the air volume is regulated.

The function of an upstream pressure regulator is otherwise known to the person skilled in the art and requires no further explanation.

Over the channel 65 can supply compressed air via the switching valve 12th in the work room 14 of the pneumatic piston 13 be directed.

When actuated, in this embodiment when depressing the actuating device 2nd and with the help of the pen 11 coupled switching valve 12th flows over the channel 65 Compressed air in the work area 14 of the pneumatic piston 13 . The pneumatic piston 13 is with the smaller hydraulic piston 18th coupled, or pneumatic piston 13 and hydraulic pistons 18th can form a component. The pneumatic piston becomes due to the inflow of compressed air 13 moving to the left from the position shown here.

If the control bore is exceeded 62 compressed air flows out of the work area 14 through the channel 16 to the pilot control valve 54 which controls the pneumatic piston 13 takes over. Through the through the channel 16 Incoming compressed air then becomes a piston 66 of the pilot control valve 54 moved to the left and the valve opens. Via the exhaust air chamber 58 can now use compressed air from the work area 14 of the pneumatic piston 13 Flow outside through a silencer (not shown).

Now the pressure in the work area 14 decreases, the pneumatic piston 13 over the spring 17th moved to the right until the piston 13 on the pilot control valve 54 touches down and closes it again. Now the work space 14 closed again and through the over the channel 15 Incoming compressed air can build up working pressure again.

The use of the pilot control valve 54 , which is axially in line with both the pneumatic piston 13 as well as with the hydraulic piston 18th is arranged, a reliable control with a large stroke and thus great performance is provided.

The system works as a hydraulic pump, i.e. the pneumatic piston 13 and thus the hydraulic piston 18th is moved oscillating. As a result, hydraulic fluid can be delivered continuously and a small working volume of the hydraulic piston 18th is sufficient to be able to provide a sufficient amount of hydraulic fluid.

In order to work as a pump, the hydraulic area has a pressure valve 59 as well as a suction valve 19th on, via which fluid delivery only in the direction of the hydraulic valve 9 to which the pulling or pressing device is connected is possible. The design of pressure valve 59 , which opens with each pumping process in which the piston is moved to the left and by the suction valve 19th Those who let hydraulic fluid flow into the working space of the hydraulic piston when the piston is reset are known to the person skilled in the art and require no further explanation.

The hydraulic valve 9 consists of a sleeve 9a and a stopper 9b , which closes the valve by means of spring force when the pulling or pressing device is not connected.

The hydraulic valve 9 is part of the quick coupling 8th which by means of a connector comprising seals 57 with the hydraulic area 20 connected is.

The quick coupling 8th can be released by turning and is fastened via the locking lever 23 locked to make sure ensure that the clutch is not accidentally released when pressure is applied.

The housing 47 the quick coupling 8th is preferably screwed to the housing of the pressure generator or to the front housing part.

The pressure generator also includes a relief valve 21st . In this exemplary embodiment, it is a three-two-way valve. The relief valve 21st is in the basic state with compressed air applied via the duct 22 open. For this purpose, the compressed air flows through the channel 22 into a work area and presses the relief piston 60 down.

Now the hydraulic fluid from the hydraulic area 20 flows back continuously, no pressure can build up.

With actuation of the actuation device 2nd becomes the channel 22 closed and the relief valve 21st closed due to spring preload. As a result, pressure can build up in the hydraulic area 20 build up.

The operator leaves the actuator 2nd again, compressed air flows through the channel 22 and opens the relief valve 21st , so that the hydraulic area immediately after releasing the actuator 2nd becomes depressurized.

In this embodiment there is also a safety control device 7 provided as an eccentric above the relief piston 60 is arranged.

A pressure build-up is only in the position of the safety control device shown here 7 possible because the eccentric releases the relief piston when the safety actuating device is flipped 60 stops in the open position and thus closes the relief valve 21st prevented.

The safety actuator 7 can be designed such that it automatically moves into an open position of the relief valve, for example by means of a spring. Before each new actuation of the actuation device 2nd then the safety actuator 7 are returned to the position shown here, in which they initially remain because they are due to the spring preload of the relief valve 21st is set. After the actuation device is actuated, the safety actuation device folds 7 back to the inactive position.

Can also via the safety actuator 7 Depending on the design variant, a two-hand operation can be provided, in which this must be operated continuously in order to build up pressure at all (not shown).

3rd shows a view of the pressure generator 1 with a view from the front of the quick coupling 8th . The quick coupling 8th comprises engagement elements which by means of the link ring 25th can be moved radially inward to lock a corresponding coupling element. In the locked state, the sliding ring can 25th by means of the locking lever 23 be locked in the locked position. The turning back of the backdrop ring 25th is only possible again when the locking lever 23 is solved.

4th shows a sectional view along the line BB out 1 . The engagement elements can be seen 24th in the form of balls, which by means of the backdrop of the backdrop ring 25th can be moved inward when rotating it.

5 shows a first pressing device 26 , which can be connected to a pressure generator described above. For this purpose, the pressing device comprises 26 a quick connector 27 , which has a groove in which the in connection with 3rd and 4th described intervention elements can intervene.

The pressing device comprises on the face side 26 a headpiece 28 with a rivet holder.

6 shows a sectional view taken along line AA 5 . The self-closing hydraulic valve can be seen 29 . The pressing device further comprises a piston 30th which by means of spring 31 is reset. When hydraulic fluid is introduced, the piston moves forward and passes over the head piece 28 the riveting process.

The press device 26 furthermore has a groove on the edge 32 on which to attach the in 7 bracket shown in a perspective view 33 is provided.

The coat hanger 33 is by means of a locking pin 34 on the pressing device ( 26 in 5 and 6 ) attached. The bracket has a rivet holder 35 on, in which the second part of the rivet is inserted in order to with the pressing device on which the bracket 33 is appropriate to carry out a setting process in which a two-part conventional rivet is processed.

8th shows a perspective view of a blind riveting device 36 which by means of the quick coupling 27 is also attachable to a pressure generator described above.

The blind riveting device 36 comprises a pulling device 37 with a head piece 38 into which the rivet pin of a blind rivet can be inserted.

The pulling device 37 is by means of a swivel bearing 39 on a holder 40 attached, which the quick coupling 27 includes. So the pulling device 37 at least 90 ° around the holder 40 be pivoted to reach hard-to-reach places.

9 shows the blind riveting device 36 with the headpiece 38 in a front view. It can be seen that the diameter of the pulling device 37 essentially the diameter of the head piece, which is usually designed to be unscrewed 38 corresponds. Pulling device and head piece are so very compact.

10 shows a sectional view of the blind riveting device 36 along the line EE out 9 .

The pulling device 37 includes a piston 42 . There is a removable container at the rear end of the pulling device 43 , in which torn rivets are collected. The swivel bearing 39 comprises a locking mechanism, via which the pulling device 37 can be locked in defined positions or locked with a pin when it is around the holder 40 is pivoted. The quick coupling can also be seen 27 with a self-closing valve for hydraulic fluid.

11 shows a further sectional view of a pulling device 36 . The claws of a gripping device can be clearly seen in this sectional view 44 for gripping the rivet pin.

A rotating union can also be seen 45 in the area of the swivel bearing 39 . Hydraulic fluid is fed to the traction device via the rotating union.

The quick coupling 27 includes a self-closing hydraulic valve 29 which in 12th is shown in detail.

The self-closing hydraulic valve is in a housing 47 the quick coupling and is placed on the face of the seal 46 sealed. When coupling to the quick coupling of the pressure generator ( 8th in 2nd ) becomes the sleeve 55 pressed to the left, whereby a corresponding sleeve of the quick release of the pressure generator ( 9a in 2nd ) in the housing 47 penetrates and over the seal 46 is sealed. The sleeve 55 is with the spring 48 kept under tension. A central pin 56 now simultaneously presses the plug of the hydraulic valve of the pressure generator ( 9b in 2nd ) inwards so that a channel is created between the hydraulic valves through which hydraulic fluid can flow.

13 shows an improved rivet insert 49 , which can be used for example in connection with the press device described above. The rivet insert 49 is intended for known rivet heads on the market. For this purpose, a head piece known per se 51 by means of an adapter sleeve 52 which on a clamping cone 53 is pulled, attached. For this, the components are in the housing 50 used.

14 shows a sectional view along the line BB in 13 . In particular, you can see the clamping sleeve slotted below 52 which from the clamping cone 53 is spread out at the bottom and thus a non-positive attachment of the head piece 51 provides.

In contrast to known receptacles for rivet heads, this receptacle has no thread by means of which the head piece is attached. In known recordings with a thread, the screw connection can loosen. The thread is then destroyed during pressing, which cannot happen with the holder shown here.

15 shows a further detailed representation of the principle. The clamping cone can be seen 53 , which has an approximately claw-shaped profile in the sectional view. Because of the adapter sleeve 52 these claws lie positively and non-positively on the head piece 51 on.

Referring to 16 Another, alternative embodiment variant of the invention is to be explained, in which the pressure generator described above is operated in a stationary manner. A handle is shown 80 with a quick coupling 81 , which corresponds to the quick coupling of the pressure generator and to which the previously shown pressing and pulling tools can be connected.

The handle 80 has an actuator 32 on which a pulling or pressing process can be set up.

The handle is connected 80 via a hydraulic line 83 . This is preferably connected to the pressure generator by means of a quick coupling (not shown).

The handle also includes the pneumatic control lines 84 and 85 , which on a correspondingly modified pressure generator preferably also by means of a quick coupling are connected and via this according to the function of the actuator 2nd in 2nd can be controlled.

The use of such a handle makes it possible for the hand-held device with which rivets are set, for example, to be even more compact.

The invention enables in particular very compact riveting and pressing tools, by means of which a very high tensile force can be exerted.

Reference list

1

Pressure generator

2nd

Actuator

3rd

Pressure regulator

4th

Handle

5

casing

6

Compressed air connection

7

Safety control device

8th

Quick coupling

9

Hydraulic valve

9a

Sleeve

9b

Plug

10th

screw

11

pen

12th

Switching valve

13

Pneumatic piston

14

working space

15

channel

16

channel

17th

feather

18th

Hydraulic pistons

19th

Suction valve

20

Hydraulic area

21

Relief valve

22

channel

23

Locking lever

24th

Engaging element

25th

Backdrop ring

26

Pressing device

27

Quick coupling

28

Headpiece

29

Hydraulic valve

30th

piston

31

feather

32

Groove

33

Rivet bracket

34

Locking pin

35

Rivet holder

36

Blind riveting device

37

Traction device

38

Headpiece

39

Swivel bearing

40

holder

41

Locking mechanism

42

piston

43

container

44

Gripping device

45

Rotary union

46

poetry

47

casing

48

feather

49

Rivet insert

50

casing

51

Headpiece

52

Adapter sleeve

53

Expansion cone

54

Pilot control valve

55

Sleeve

56

pen

57

Connector

58

Exhaust chamber

59

Pressure valve

60

Relief piston

61

Flow control valve

62

Control bore

63

Valve seat

64

piston

65

channel

66

piston

80

Handle

81

Quick coupling

82

Actuator

83

Hydraulic connection

84

Pneumatic control line

85

Pneumatic control line

Claims (11)

Pressure generator (1) for a hydraulic tool, in particular for a pulling and / or pressing device, comprising a pneumatic piston (13) which is coupled to a hydraulic piston (18), the pneumatic piston (13) being able to be oscillated by means of a control device, so that a pressure can be generated by oscillating movement of the hydraulic piston (18) in a hydraulic area (20), and wherein the hydraulic area (20) has a quick coupling (8) with a hydraulic line for a hydraulic tool, the hydraulic area (20) having a relief valve ( 21), which can be actuated with the control device and / or with an actuating device (2), such that the relief valve (21) opens in a non-actuated position, characterized in that the relief valve (21) is equipped with a safety actuation device (7) connected, which must be actuated in order to use the actuating device (2) to pressure in the hydraulic region (20) to create. Pressure generator (1) for a hydraulic tool according to the preceding claim, characterized in that the control device comprises a piston control. Pressure generator (1) for a hydraulic tool according to the preceding claim, characterized in that a pilot control valve (54) can be moved into a closed position via the pneumatic piston (13). Pressure generator (1) for a hydraulic tool according to one of the preceding claims, characterized in that the relief valve (21) is connected via a pneumatic line to the control device and / or to the actuating device. Pressure generator (1) for a hydraulic tool according to one of the preceding claims, characterized in that a hydraulic fluid reservoir is arranged in a chamber which extends at least partially around the hydraulic piston (18). Pressure generator (1) for a hydraulic tool according to one of the preceding claims, characterized in that the quick coupling (8) has a self-closing valve (9) for hydraulic fluid. Pressure generator (1) for a hydraulic tool according to one of the preceding claims, characterized in that the pressure generator (1) has an actuating device (2). Pressure generator (1) for a hydraulic tool according to one of the preceding claims, characterized in that the quick coupling (8) has engagement elements (24) which can be moved radially in the direction of a central axis by means of a link guide. Pressure generator (1) for a hydraulic tool, in particular according to one of the preceding claims, comprising a pneumatic piston (13) which is coupled to a hydraulic piston (18), wherein the pneumatic piston (13) can be moved in an oscillating manner by means of a control device, so that by means of an oscillating Moving the hydraulic piston (18) in a hydraulic region (20) can generate a pressure, a pilot control valve (54) being operable in a working space (14) of the pneumatic piston (13) by resetting the pneumatic piston (13), in particular being movable into a closed position , and wherein the pilot control valve (54) is connected to the working space (14) via a channel, which comprises a control bore (62), wherein when the control bore (62) is exceeded, compressed air from the channel (16) to the pilot control valve (54 ) flows. Pulling or pressing tool (36), in particular riveting tool, punching tool or cartridge press, comprising at least one hydraulic region with a hydraulic piston (42) which is connected to a pressure generator (1) according to one of the preceding claims by means of a quick coupling (27). Tool system comprising a pressure generator (1) according to one of the preceding claims and a plurality of different pulling and / or pressing devices which can be connected to the pressure generator (1) by means of a quick coupling (27).

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