DE102007007294B3 - Drive unit with coupling for tool heads has housing with chamber for accumulators in end remote from coupling with total voltage of at least 12 Volts; chamber covered by removable cap has hydraulic pump with piston with transverse axis - Google Patents

Abstract

The drive unit has a housing (27) with a chamber for accumulators at its end remote from the coupling (18P) with a total voltage of at least 12 Volts, whereby the chamber is covered by a removable cap (27a). It has a hydraulic pump with a pump piston whose axis is transverse to the longitudinal axis (A-A). The electric motor is arranged between the hydraulic pump and the working cylinder.

Description

The Erfidung relates to a drive unit with a coupling for tool heads for Deformation of workpieces with a manageable housing, in which a chamber for Accumulators, an electric motor, a hydraulic pump with a pump cylinder and a pump piston, a working cylinder for the tool head and a Hydraulic reservoir are arranged, wherein the housing has a cylindrical Handle with a longitudinal axis has.

Hand-operated press tools often have a laterally extending handle, similar to a pistol handle, with an electrical switch in place of the trigger. By the U.S. Patent 5,195,354 it is known to connect to this handle either a battery cable or an accumulator housing ( 6 ). As a result, however, the device becomes bulky transversely to the viewing direction and unmanageable for hard to reach places of use, in particular when approaching a rechargeable battery housing. Since the cross-section of the battery case is only slightly larger than that of the handle, the charge capacity of the battery and thus the performance of the device is limited.

By the DE 297 03 053 U1 and the EP 0 860 245 B1 a hydraulic pressing device for press heads is known, which is provided with a cable for a power connection and is approximately rod-shaped. As a result, there is no need to provide a chamber for receiving power sources. At the end, therefore, the required drive motor is provided.

By the DE 203 03 877 U1 Another rod-shaped pressing device is known in which the electric motor is likewise arranged at the end of the housing. Although it is stated that this engine can be battery powered, however, the font is silent about where to put the batteries.

By the DE 20 2004 000 215 U1 is a hand-held, also substantially rod-shaped pressing device known in which the electric motor, the hydraulic pump and the hydraulic reservoir are shown only schematically as blocks outside the piston-cylinder unit. However, the document is silent about the way in which the electric motor, the hydraulic pump and the hydraulic reservoir are arranged within the drive housing. Also about the accommodation of power sources, the document is completely silent.

By the DE 42 02 348 C1 is an expansion head for hollow workpieces such as pipes, etc., known in which sector-shaped expansion jaws can be moved in the radial direction by an axially displaceable expanding mandrel. It is thus implemented an axial force on the sliding surfaces between expanding mandrel and expansion jaws in radial forces. As drives for both pliers lever and motor hydraulic drives with thrust piston are known.

Of the Invention is in contrast the object of an approximately rod-shaped drive unit for tool heads to the effect to develop, which is characterized by a large volume for a larger battery or accumulator capacity and voltage characterized, whereby driving force, duration of use and working speed be increased without falling out of the frame of a hand-held device and to endanger ergonomic handling.

• a) das Gehäuse an seinem der Kupplung abgekehrten Ende die Kammer für Akkumulatoren mit einer Gesamtspannung von mindesten 12 Volt besitzt, welche Kammer durch eine lösbare Kappe abgedeckt ist,
• b) die Hydraulikpumpe einen Pumpenkolben besitzt, dessen Achse quer zur Längsachse verläuft, und dass
• c) der Elektromotor zwischen der Hydraulikpumpe und dem Arbeitszylinder angeordnet ist.

To solve this problem, the invention proposes that

• a) the housing has at its end facing away from the coupling the chamber for accumulators with a total voltage of at least 12 volts, which chamber is covered by a detachable cap,
• b) the hydraulic pump has a pump piston whose axis is transverse to the longitudinal axis, and that
• c) the electric motor between the hydraulic pump and the working cylinder is arranged.

With this solution the following advantages are associated: The drive unit draws through a big volume for a bigger one Battery or accumulator capacity and voltage, thereby reducing drive power, Duration of use and working speed can be increased without out of the frame of a handheld device fall out and compromise ergonomic handling.

• – das Gehäuse mehrteilig ausgebildet ist und den Griffteil und ein Antriebsgehäuseteil besitzt, in dem die Kammer für die Akkumulatoren und die Hydraulikpumpe angeordnet sind, und dass der Elektromotor und der Arbeitszylinder im Griffteil angeordnet sind,
• – zwischen dem Griffteil und dem gegenüber dem Griffteil im Querschnitt grösseren Antriebsgehäuseteil eine Schrägfläche angeordnet ist, die einen zusätzlichen Längsabschnitt des Griffteils in Richtung auf die Kappe freigibt,
• – eine Auslösetaste für die Auslösung der Arbeitsfunktion auf derjenigen Seite des Griffteils angeordnet ist, auf der sich der zusätzliche Längsabschnitts des Griffteils befindet,
• – das Antriebsgehäuseteil auf der der Schrägfläche gegenüber liegenden Seite eine radiale Stirnfläche besitzt,
• – das Hydraulikreservoir U-förmig ausgebildet ist und mit seinen beiden Schenkeln die Längsachse umschliesst,
• – das Hydraulikreservoir ein zwischen der Hydraulikpumpe und dem Elektromotor angeordnetes Pumpengetriebe umschliesst,
• – das Hydraulikreservoir aus einem elastomeren Werkstoff besteht,
• – das Pumpengetriebe und das Hydraulikreservoir auf einem Pumpenträger angeordnet sind, in dem der Pumpenzylinder gelagert ist,
• – dem Arbeitszylinder koaxial eine Kupplung vorgelagert ist, die aus dem Gehäuse vorsteht und in die Werkzeugköpfe aus der Gruppe Presszangenköpfe und Expanderköpfe derart einsetzbar sind, dass sie durch den Arbeitskolben des Arbeitszylinders betätigbar sind,
• – die Kupplung gabelförmig ausgebildet ist und zwei Schenkel besitzt, an denen ein als Presszangenkopf ausgebildeter Werkzeugkopf mittels eines Riegels festlegbar ist,
• – an den Arbeitskolben abnehmbar ein Rollenbock mit einem Paar von Spreizrollen für die Betätigung von als Presszangenköpfe ausgebildeten Werkzeugköpfen angeschlossen ist,
• – die Kupplung als Zylinderfortsatz des Arbeitszylinders und mit einem Innengewinde ausgebildet ist, in das ein Adapter einschraubbar ist, der mittels eines Aussengewindes zur Aufnahme eines Werkzeugkopfes mit Expanderbacken dient,
• – der Adapter eine koaxiale Innenbohrung besitzt, in der ein Spreizdorn für die Radialbewegungen der Spreizbacken axial bewegbar ist, und/oder, wenn
• – an den Arbeitskolben abnehmbar ein Spreizdorn für die Betätigung von als Expanderköpfe ausgebildeten Werkzeugköpfen angeschlossen ist.

It is particularly advantageous in the course of further embodiments of the invention if, either individually or in combination:

• - The housing is formed in several parts and has the handle part and a drive housing part in which the chamber for the accumulators and the hydraulic pump are arranged, and that the electric motor and the working cylinder are arranged in the handle part,
• An oblique surface is arranged between the grip part and the drive housing part which is larger in cross-section than the grip part and releases an additional longitudinal section of the grip part in the direction of the cap,
• A release button for triggering the work function is arranged on that side of the grip part on which the additional longitudinal section of the grip part is located,
• - The drive housing part on the side opposite the inclined surface a radial end possesses area,
• - The hydraulic reservoir is U-shaped and encloses with its two legs, the longitudinal axis,
• The hydraulic reservoir encloses a pump transmission arranged between the hydraulic pump and the electric motor,
• - The hydraulic reservoir consists of an elastomeric material,
• - The pump gear and the hydraulic reservoir are arranged on a pump carrier in which the pump cylinder is mounted,
• - The working cylinder is coaxially preceded by a coupling which protrudes from the housing and in the tool heads from the group pressing tongs heads and expander heads are used so that they can be actuated by the working piston of the working cylinder,
• - The coupling is fork-shaped and has two legs on which a trained as a pressing tongs head tool head is fixed by means of a bolt,
• Detachably connected to the working piston is a roller block connected to a pair of spreading rollers for actuating tool heads designed as pressing tongs heads,
• - The coupling is designed as a cylinder extension of the working cylinder and with an internal thread into which an adapter can be screwed, which serves by means of an external thread for receiving a tool head with Expander jaws,
• - The adapter has a coaxial inner bore in which an expanding mandrel for the radial movement of the expansion jaws is axially movable, and / or, if
• - Removable mandrel for the actuation of designed as expander heads tool heads is connected to the working piston.

Two embodiments of the subject invention, their individual parts, assemblies and modes of action and other advantages will be described below with reference to the 1 to 10 explained in more detail.

It demonstrate:

1 a perspective view of the internal structure of a first embodiment of a drive device for a pressing tongs head,

2 a schematic longitudinal section through the article of 1 .

3 a perspective view of the hydraulic reservoir in an overhead view,

4 a perspective view of the roller block for driving a pressing tongs head,

5 a perspective view of the assembly of electric motor, bellhousing, hydraulic reservoir and eccentric housing in overhead view,

6 an exploded view of 5 .

7 an external perspective view of a complete drive unit according to 1 , equipped with a pressing tongs head, so a total of a pressing device,

8th an external perspective view of a second embodiment of a complete drive device, equipped with an expansion head, in total so an expansion device,

9 a perspective view of the internal structure of the second embodiment of a drive device for an expansion head and

10 a schematic longitudinal section through the article of 9 ,

In the 1 and 2 is shown - from right to left - the following: A group of accumulators (rechargeable batteries) 1 with an operating voltage of at least 12 volts, in this case 10 batteries, a spacer 2 with a remote partition 3 , a bellhousing 4 with a circuit board 4a with electronic controls and with an inserted pump cylinder 5 and a pump piston 6 , an eccentric housing 7 in which a warehouse 8th for a gear shaft 9 and an eccentric arranged on this 10 , a pump gearbox 11 On three sides of a hydraulic reservoir 12 (to 3 ) is surrounded, an electric motor 13 with a motor shaft 13a and plug contacts 13b , and an adapter 14 for screwing in a working cylinder 15 in which a working piston 16 is arranged, that of a return spring 17 is surrounded.

The working cylinder 15 is with a clutch 18P provided, with the addition P stands for a pressing device. The coupling 18b is fork-shaped in this case and has two side cheeks 18a and 18b for the interchangeable insertion of a tool head 19P (eg after 7 ). For its operation is a replaceable roller block 20 with two spreader rollers 20a and 20b (to 4 ) intended. For holding the tool head 19P serves a diametrical bar 21 with a handle 21a , One of the hydraulic lines 22 is shown. The mechanism for the reversal of the hydraulic fluid between the pump and reservoir or flow and return of the working piston 16 located in the bellhousing 4 , Such switching mechanisms are in themselves state of the art.

The 3 shows further details of the hydraulic reservoir 12 : This consists of a U-för migen container made of an elastomeric material with two lateral legs 12a and 12b in the installed state, the pump gear 11 enclose between themselves. The spatial definition is done via a molded version 23 , two metal frames 24 and 25 and four screws 26 on the pump carrier 4 , Two hose nozzles 12c and 12d are used for filling, bleeding and for connection to the hydraulic circuit. The arrangement is space-saving and very flexible against volume fluctuations.

The 4 shows more details of the roller block 20 : In a U-shaped bearing block 20c standing on the end of the working piston 16 can be plugged, are the two spreader rollers 20a and 20b , The spreading rollers 20a and 20b support each other so that their journals are relieved.

The 5 and 6 show the structure of a assembly-friendly assembly of electric motor 13 with the plug contacts 13b , Bellhousing 4 , Hydraulic reservoir 12 and eccentric housing 7 in over-head representation. The lower end of the pump cylinder 5 just barely protrudes from the bellhousing 4 out. The 6 shows in particular the pump cylinder 5 and the eccentric ring 7a for the pump piston 6 , The transmission shaft 9 is by means of a rolling bearing 9a in the eccentric housing 7 stored.

The 7 shows in particular the case 27 for holding the assemblies and components after the 1 to 6 , The housing end is replaced by a cap 27a formed the space for holding the batteries 1 encloses and by a pushbutton 27b is unlockable. The main part of the housing 27 form two mirror-symmetrical housing halves 27c and 27d , which are connected to an axis-parallel and diametrical parting line 27e push against each other.

The housing halves 27c and 27d form a handle part 28 That, apart from surface profiling 28a to increase the grip - lies in a cylindrical surface. The handle part 28 ends towards the tool head 19P in a torus 28b , and in front of this torus 28b is a shutter button 30 arranged for the commissioning of the device.

The housing halves 27c and 27d but also form a drive housing part 31 , which has a much larger cross section and the partition 3 , the pump carrier 4 , the eccentric housing 7 , the pump gearbox 11 and the hydraulic reservoir 12 encloses. The transition between grip part 28 and drive housing part 31 is stepped over an inclined surface 32 at an angle between 30 and 60 degrees to the axis of the handle 28 runs and from a radial end face 37 emanates. In use, the palm of the hand of the operator are on the inclined surface 32 and the little finger on the face 37 on, by means of the thumb, the shutter button 30 is operable. This bevel 32 and the frontal area 37 are an effective protection against slipping of the device in difficult working positions. The cross sections of cap 27a and drive housing part 31 transverse to the longitudinal axis or to the drawing plane 2 are at least largely identical and large and allow the accommodation of a large number of batteries.

The housing halves 27c and 27d consist of a thermoplastic-shaped plastic, wherein the handle part 28 additionally with an adherent coating 29 can be provided from a non-slip plastic.

From the torus 28b sticks out the clutch 18P ( 1 and 2 ) for the tool head 19P which in the case shown is a press head. This is interchangeable and consists in a known manner of two double-armed levers 33 , whose joints 34 on opposite sides by tabs 35 connected to each other. These tabs 35 are in turn connected to a not visible here, common extension, between the side cheeks 18a and 18b the clutch 18P introduced and through the bar 21 with the handle 21a is fixed. On the inner sides of the coupling-side ends of the lever 33 acts the roller block 20 to 4 in a known manner. The clutch remote ends of the lever 33 close a pliers mouth on their insides 36 one. Hereby it is possible to press liquid-tight into one another inserted pipe ends and mechanically firmly together.

The tool head shown here 19P can also be controlled by a tool head 19E replace that as the expansion head after the DE 42 02 348 C1 is executed.

In the associated 7 to 10 To avoid repetition, the reference numerals for the previously used device components are used. Also the assemblies and components after the 3 to 6 are also for the embodiment of the 7 to 10 used. To the ring bulge 28b agree also the components and the spatial form of the housing 27 match, so that the same advantageous operating characteristics.

In 8th is the tool head shown here 19E in front of the torus 28b , This tool head has a cap 38 with a radially inwardly directed annular flange 38a , In it are by means of rivets 38b six sector-shaped expander jaws 39 guided radially displaceable.

According to the 9 and 10 is beyond the adapter 14 - from the batteries 1 seen from - the working cylinder 15 with the clutch 18P through a working cylinder 40 with a clutch 18E replaced, as a cylinder extension with an internal thread 40a is trained. In this internal thread 40a is replaceable another adapter 41 used, which carries two external threads, of which the right with the internal thread 40a is mating and the left external thread 41a for screwing on the tool head 19E to 8th serves. The adapter 41 still has a coaxial bore 41b in which a expanding mandrel 42 is displaceable. This is, again releasably, with the otherwise largely identical working piston 16 bolted and serves for radial displacement of the expander jaws 39 ( 8th ).

This radial displacement is z. As the precursor of the compression, namely by a pipe end is so far expanded (expanded) that a non-flared pipe end can be inserted. For this application, it is only necessary, the fork-shaped coupling 18P through a tubular coupling 18E with an internal thread 40a and an adapter 41 to provide for an expansion head, and the roller block 20 through the expanding mandrel 42 to replace. This can be done in the factory, by competent personnel but also at the place of use.

Through a synopsis of 1 to 7 and 8th to 10 shows that the invention provides a slim drive tool for tool heads, which is characterized by a larger volume for a larger battery capacity and higher battery voltage, which drive power, operating time and operating speed are increased, which in turn leads to larger volumes and weights for the drive elements , and that it nevertheless managed to maintain the handiness and safety. The ergonomically designed housing 27 leads to a storage space for the clever placement of the drive components. The axis AA of the system is in the 2 . 7 . 8th and 10 indicated.

1

accumulators (Batteries)

2

spacer

3

partition wall

4

bellhousing

4a

circuit board

5

pump cylinder

6

pump pistons

7

eccentric housing

7a

eccentric

8th

camp

9

gear shaft

9a

roller bearing

10

eccentric

11

gear pumps

12

hydraulic reservoir

12a

leg

12b

leg

12c

hose nozzle

12d

hose nozzle

13

electric motor

13a

motor shaft

13b

plug contacts

14

adapter

15

working cylinder

16

working piston

17

Return spring

18P

clutch (P = for pressing)

18E

clutch (E = to expand)

18a

side cheek

18b

side cheek

19P

tool head (P = for pressing)

19E

tool head (E = to expand)

20

Rollenbock

20a

spreader

20b

spreader

20c

bearing block

21

bars

21a

handle

22

hydraulic line

23

version

24

metal frame

25

metal frame

26

screw

27

casing

27a

cap

27b

pushbutton

27c

housing half

27d

housing half

27e

parting line

28

handle part

28a

surface profiles

28b

torus

29

coating

30

release button

31

Drive housing part

32

sloping surface

33

lever

34

joints

35

tabs

36

beaks

37

face

38

Screw cap

38a

annular flange

38b

rivet

39

expander jaws

40

working cylinder

40a

inner thread

41

adapter

41a

external thread

41b

drilling

42

expanding mandrel

A-A

axis of the system

Claims (15)

Drive unit with a clutch ( 18P . 18E ) for tool heads ( 19P . 19E ) for deforming workpieces with a manageable housing ( 27 ), in which a chamber for accumulators ( 1 ), an electric motor ( 13 ), a hydraulic pump with a pump cylinder ( 5 ) and a pump piston ( 6 ), a working cylinder ( 15 ) for the tool head ( 19P . 19E ) and a hydraulic reservoir ( 12 ) are arranged, wherein the housing ( 27 ) a cylindrical handle part ( 28 ) having a longitudinal axis (AA), characterized in that a) the housing ( 27 ) at its the clutch ( 18P . 18E ) turned away the end of the chamber for accumulators ( 1 ) with a total voltage of at least 12 volts, which chamber has a detachable cap ( 27a ), b) the hydraulic pump is a pump piston ( 6 ) whose axis is transverse to the longitudinal axis (AA), and that c) the electric motor ( 13 ) between the hydraulic pump and the working cylinder ( 15 ) is arranged. Drive unit according to claim 1, characterized in that the housing ( 27 ) is formed in several parts and the handle part ( 28 ) and a drive housing part ( 31 ) in which the chamber for the accumulators ( 1 ) and the hydraulic pump are arranged, and that the electric motor ( 13 ) and the working cylinder ( 15 ) in the handle part ( 28 ) are arranged. Drive unit according to claim 2, characterized in that between the handle part ( 28 ) and the opposite the handle part ( 28 ) in cross-section larger drive housing part ( 31 ) an inclined surface ( 32 ) is arranged, which has an additional longitudinal portion of the handle part ( 28 ) towards the cap ( 27a ) releases. Drive unit according to claim 3, characterized in that a release button ( 30 ) for triggering the work function on the side of the handle part ( 28 ) is arranged, on which the additional longitudinal portion of the handle part ( 28 ) is located. Drive unit according to claim 3, characterized in that the drive housing part ( 31 ) on the inclined surface ( 32 ) opposite side a radial end face ( 37 ) owns. Drive unit according to claim 1, characterized in that the hydraulic reservoir ( 12 ) Is U-shaped and with its two legs ( 12a . 12b ) encloses the longitudinal axis (AA). Drive unit according to claim 6, characterized in that the hydraulic reservoir ( 12 ) between the hydraulic pump and the electric motor ( 13 ) arranged pump gear ( 11 ) encloses. Drive unit according to claim 6, characterized in that the hydraulic reservoir ( 12 ) consists of an elastomeric material. Drive unit according to claim 1, characterized in that the pump gear ( 11 ) and the hydraulic reservoir ( 12 ) on a bellhousing ( 4 ) are arranged, in which the pump cylinder ( 5 ) is stored. Drive unit according to claim 1, characterized in that the working cylinder ( 15 ) coaxially a coupling ( 18P . 18E ), which comes out of the housing ( 27 ) and into the tool heads ( 19P . 19E ) from the group pressing tongs heads and expander heads are used so that they by the working piston ( 16 ) of the working cylinder ( 15 ) are operable. Drive unit according to claim 10, characterized in that the coupling ( 18P ) is fork-shaped and has two legs ( 18a . 18b ), on which a tool head designed as a pressing tongs head ( 19P ) with a bolt ( 21 ) is determinable. Drive unit according to claim 10, characterized in that on the working piston ( 16 ) detachable a roller block ( 20 ) with a pair of spreader rollers ( 20a . 20b ) for the operation of tool heads designed as pressing tongs heads ( 19P ) connected. Drive unit according to claim 10, characterized in that the coupling ( 18E ) as cylinder extension of the working cylinder ( 40 ) and with an internal thread ( 40a ) is formed, in which an adapter ( 41 ) is screwed, which by means of an external thread ( 41a ) for receiving a tool head ( 19E ) with expander jaws ( 39 ) serves. Drive unit according to claim 13, characterized in that the adapter ( 41 ) a coaxial inner bore ( 41b ), in which an expanding mandrel ( 42 ) for the radial movements of the expanding jaws ( 39 ) is axially movable. Drive unit according to claim 13, characterized in that on the working piston ( 16 ) removable an expanding mandrel ( 42 ) for the operation of tool heads designed as expander heads ( 19E ) connected.