EP3536952B1 - Connection device of hydraulic pump unit - Google Patents

Description

The invention relates to a hydraulic connection device with the features in the preamble of claim 1.

Such a connection device is used, for example, in hydraulic units, which are used as compact structural units in various types of conveying and lifting equipment for actuating lifting cylinders. the WO 2009/156017 A1 discloses a hydraulic unit, in particular for supplying conveying and lifting equipment with hydraulic fluid, with a tank located at the end of a main axis of the device and functional components attached to it, which comprise at least one hydraulic pump and a connecting body with a valve device and a line arrangement for sucking in and returning hydraulic fluid has the or to the tank. The hydraulic unit is designed as a so-called turning unit, in which the inlet end of the suction line of the line arrangement is arranged inside the tank at a point at which, when the unit is operated with a vertical main axis and when the unit is operated with the main axis inclined, preferably perpendicular, to the vertical , the reason for the liquid in the tank.

Another hydraulic unit, in particular for the supply of conveying and lifting gear with hydraulic fluid, is from the DE 10 2015 008 837 A1 known. In this hydraulic unit with a tank located at the end with respect to a main axis of the device and functional components attached to it, which consist of at least one hydraulic pump and a connection body as well as an electric motor for driving the hydraulic pump, the connection body is composed of at least one structural unit and at least one further structural unit, wherein the one structural unit is at least partially accommodated in the further structural unit. In this case, one structural unit is preferably made from a metal material, such as aluminum material, as a die-cast or forged part, and the other structural unit is made from a plastic material, such as glass fiber-reinforced polyamide material.

The production of the connection device or the connection body is time-consuming and costly. The machining of the base body designed as a master or formed part is typically carried out in several machining steps, with the base body being held and machined in several positions by re-clamping on a machine tool using appropriate holding devices or collets.

the EP 2 241 753 A1 describes a connection device, consisting of a base body, which has at least two connection units with different topographies, in the sense of different three-dimensional shapes, and functions, which are connected to one another in one piece, and which, designed as a master or formed part, is at least partially machined on its outer surfaces is, wherein the outer surfaces of the one connection unit lying on opposite sides of the one connection unit are arranged at least partially parallel to one another, with one of the outer surfaces of the other connection unit being perpendicular or at a predeterminable angle to at least a part of the machined outer surfaces of the one connection unit, and wherein a connecting bore serves to supply a consumer with fluid under pump pressure.

More connection devices go from the DE 10 2016 010 669 A1 , the EP 1 666 726 A2 , the DE 20 2005 005 620 U1 and the DE 199 59 022 C1 out.

The object of the invention is to simplify the production of a hydraulic connection device without restricting its functionality, with the aim in particular of reducing the number and complexity of the production steps.

This object is achieved by a hydraulic connection device having the features of patent claim 1 in its entirety, by a hydraulic pump assembly having the features of patent claim 11 in its entirety and by a method having the features of patent claim 12 in its entirety. Advantageous configurations of the invention are the subject matter of the dependent claims.

According to the characterizing part of claim 1, it is provided that at least one outer surface of the one connection unit is left unmachined to form an engagement surface for the engagement of a holding device pivotable at least about one axis; that the other terminal unit has more machined outer surfaces than the one terminal unit; and that a further bore, which is at least partially separated from the one connecting bore and branches off from it, serves to return fluid from the consumer to the tank.

At least one outer surface of the one connection unit is left unprocessed and designed as a possible contact surface for the attack of a holding device that can be pivoted at least about one axis at least one outer surface of the other connection unit is machined more in number than the number of machined outer surfaces of the one connection unit, and this one more machined outer surface runs perpendicularly or at a predeterminable angle to at least some of the machined outer surfaces of the one connection unit, which lying on opposite sides of the one connection unit are arranged at least partially parallel to one another.

The configuration of the connecting device according to the invention allows the base body to be completely machined in just one clamping of a machine arrangement, for example in a metal-cutting machine tool, the holding device as a workpiece holder resting in a defined manner on the at least one working surface on the base body that is not to be machined. The base body is advantageously a forged or cast blank as a formed part or original formed part. The geometry of the at least two connection units forming the base body is selected in such a way that in one clamping of the base body all the outer surfaces to be machined are freely accessible from just one machining side of the machine and all connecting bores and receptacles for connection lines and control valves are connected by associated, preferably metal-cutting, Processing steps can be introduced into the body. The base body can also be obtained from an extruded profile as part of a forming process.

Topography within the meaning of the invention means the three-dimensional design or the geometry of the respective connection unit. This can be designed as desired with its sub-areas according to the present connection options, with the sub-areas being part of an overall geometry, the fictitious outer contour of which forms, for example, a cuboid or a plate, which are referred to as cuboid or plate-shaped topography. The respective connection unit is dependent on the design of an associated hydraulic Pump unit and the attachment and installation of the associated components, such as a tank unit, a motor unit and a pump unit as well as the associated control valves, selected in a needs-optimized manner. The connection and attachment of a motor unit, a pump unit and/or a tank unit are expediently assigned to one connection unit and the connection and attachment of control valves and control lines to the other connection unit. The two connection units and the outer surfaces provided on them are selected and designed according to individual requirements. The one connection unit, which runs at least partially parallel to one another and typically has two machined outer surfaces, preferably serves to form a carrier part. The other connection unit, which has more machined outer surfaces, preferably serves to form a control unit.

In a preferred embodiment of the connection device according to the invention, the topography of one connection unit is plate-shaped and that of the other connection unit is cuboid, with the cuboid topography merging into the other connection unit at a point on the unmachined outer surface of one connection unit, which is left free for a possible attack by the holding device transitions in one piece in such a way that the cuboid topography protrudes on at least one side over the plate-shaped topography with a predeterminable overhang. This results in the advantage of a particularly compact, stable construction of the connecting device that is suitable for forming a hydraulic unit.

The connection unit having a plate-shaped topography is generally used as a support part, with the motor unit being arranged on one side, typically at the top in the normal installation position, and the tank unit and the pump unit on another side, typically at the bottom. In this preferred embodiment of the invention, the unmachined outer surface of a terminal unit is through a external, given the outer peripheral contour of the plate-shaped topography following surface. The plate-shaped topography can have a rectangular, preferably square, elliptical or circular cross-section; however, any other cross-sectional shapes are conceivable. However, an essentially circular cross section of a cylinder as a plate-shaped topography is preferably specified for the connection unit.

In the assembled state of the hydraulic unit, the other connection unit adjoining the unmachined outer surface of one connection unit with its cuboid topography protrudes beyond the combination of tank unit, connection device and motor unit on its side. In this way, the control valves and control connections arranged in the other connection unit are easily accessible from the outside and are arranged together at a central point in a space-saving manner.

In a further preferred embodiment of the connection device according to the invention, the connection unit with the plate-shaped topography with its oppositely arranged outer surfaces serves as a functional part on the one hand for accommodating a motor unit and on the other hand for accommodating a pump unit, which is preferably integrated into a tank unit, the other connection unit with the cuboid topography serves as a functional part for at least partially accommodating control valves. The outer surfaces of the one connection unit with the plate-shaped topography, which are opposite at the end face, are particularly preferably designed to be essentially planar. This makes it easier to fit and fasten the motor unit and the pump unit to the base body. Structuring, such as, for example, specially shaped depressions or receptacles, is expediently formed on the respective outer surface adjacent to the planar surface sections Area sections provided within the respective topography and as part of the same.

Particularly preferably, the one connection unit with its plate-shaped topography forms an at least partially cylindrical part of the base body, with a central recess being provided concentrically to this cylindrical outer contour and extending through the one connection unit, which is provided by a drive shaft of the motor unit, preferably in the form of an electric motor, for the Drive the pump unit is designed as a pressure supply device penetrable. A connection device configured in this way can be arranged in a particularly simple manner on a hydraulic unit that is essentially cylindrical as a whole, with the motor unit, the connection unit with the plate-shaped topography and the tank unit preferably having approximately the same outside diameter. Due to the central recess formed in the assigned connection unit, the shaft drive of the motor unit for the hydraulic pump can be guided safely and centrally in the connection device and reaches into the inside of the tank in the tank housing, protected from any damage. This results in the further advantage of a particularly simple and safe configuration of a hydraulic pump assembly equipped with the connection device according to the invention.

The connection device designed according to the invention is characterized in particular by the fact that all processing steps for processing the base body can be carried out in only one working direction with the cutting processing tool. The different machining positions "from the front", "from the back" and "sideways" are each assumed by a pivoting movement of the holding device, which can be pivoted about at least one axis and grips and holds the base body on the contact surface that is left unmachined throughout the entire machining process. Through which a clamping will be Alignment errors are excluded and errors that can otherwise occur when reclamping are avoided. The spatial arrangement and design of the individual outer surfaces and the topographies of the individual connection units are selected in such a way that all connection and control lines and installation spaces for associated control valves can be machined into the base body through corresponding bores. The associated fluid-carrying branches and crossing points result from the introduction of different partial bores from different directions in the respective connection unit of the base body. Due to the associated pivoting movement of the holding device as a workpiece holder for the base body into the corresponding machining positions, the outer surfaces to be machined are preferably positioned perpendicular to one machining direction. The processing direction is preferably specified via the infeed axis of a rotary driven tool, such as a drill, milling cutter, etc.

In a further preferred embodiment of the connection device according to the invention, connecting bores run between the plate-shaped and the cuboid topography and at the point of transition between the two topographies in the base body, the free ends of which open out on the outer surfaces of the respective connection unit. The connecting bores each have a connecting bore part running in one connection unit and a further connecting bore part running in the other connection unit. At least two machining steps are required to introduce the respective connection bore, a bore in one connection unit and a further bore in the other connection unit, the two bores made in the base body and correspondingly the associated pivoting positions of the holding device for introduction of the bores in the base body are at a predetermined, for example vertical, angle to one another.

In the connection device according to the invention, a connecting hole serves to supply a consumer with fluid under pump pressure and another hole that is at least partially separated from the one connecting hole and branches off from it serves to return fluid from the consumer to the tank. The connecting bore runs from an outer surface on one connection unit via the point of transition between the two topographies to an outer surface of the other connection unit. The part of the bore associated with the connection point for pressure supply and return is expediently introduced into the base body from an outer surface of the other connection unit running at an angle of preferably 45° to the machined outer surface of one connection unit. It goes without saying that the bores can have the same or different bore diameters. Particularly preferably, the bores or bore parts have a stepped profile in the end sections assigned to the respective outer surface.

Advantageously, at a point between the connecting bores of the pressure supply and return, a receptacle for a pressure-limiting valve is provided, which extends through an outer surface of the other connection unit, which in the present case runs perpendicular to at least one machined outer surface of the one connection unit. It is also advantageous that in the other connection unit, a receptacle for a non-return valve opens out into the connection bore, which is used for the pressure supply. In a further preferred embodiment of the invention is at another point between the connecting bores of pressure supply and return for a further valve group, the preferably has an electromagnetically actuable proportional valve or some other hydraulic valve, a receptacle is provided which extends through the outer surface of the other connection unit, which runs parallel to at least one machined outer surface of the one connection unit.

The number and arrangement of the outer surfaces of the other connection unit, which form the control block for the hydraulic unit with their cuboid topography, is selected in such a way that the valve installation spaces, formed by receptacles, and the control lines, formed by connecting bores, together with the associated crossing points in one working direction and in a clamping of an associated cutting tool can be introduced into the base body. Here, the holding device holding the base body assumes at least three, preferably four, pivot positions, with the outer surfaces to be machined being aligned perpendicular to the working direction and being machined by the cutting tool.

A particular configuration of the control block formed by the connection device is achieved in that the pressure supply and return share a connection point that emerges on an outer surface of the other connection unit, which is at a predeterminable angle, preferably 45°, to at least one machined outer surface of one Connection unit runs. It should be noted here that part of the bore for forming the connecting bore part for the return is closed during operation of the associated hydraulic unit, since it is not functional. While one connection unit, which accommodates the motor unit, the pump unit and the tank unit, only has this accommodation or carrier function, all the components and associated installation spaces for the hydraulic control are formed in the other connection unit, which is typically arranged laterally. Due to the one-piece design of the base body with a connection unit and the at least one other connection unit, the arrangement of a separate control block on the receiving or carrier part can be omitted.

The invention further relates to a hydraulic pump unit with a connection device according to the invention, with an electric motor unit on one side and a pump unit, which is preferably integrated in a tank unit, on the other side of the one connection unit, and with at least one control valve for operating the Aggregate is included in the recordings of the other connection unit.

The invention further relates to a method for producing a connecting device according to the invention, in which the one unmachined outer surface of the one connecting unit is gripped by means of a holding device that can be pivoted about at least one axis, in order, by a pivoting process of, for example, 180° via different, machining operations from only one working direction to allow in at least three, preferably four, pivot positions, and to process the outer surfaces of both connection units for the later recording of a motor-pump unit together with at least one control valve. Panning operations through angles greater than 180° are possible.

The method according to the invention enables the base body for the connecting device to be machined in one clamping of the base body, with the individual positions for machining external surfaces being assumed by an associated pivoting movement of the holding device with the base body arranged therein. Processing from just one working direction reduces complexity and further saves time and money. The base body for the connection device according to the invention is particularly preferably designed in such a way that after mechanical machining within the scope of the method according to the invention, only the control valves must be used in order to obtain a ready-to-operate connection device for a hydraulic pump unit. Typical areas of application of such hydraulic units are machine tools or lifting/lowering applications, for example industrial trucks or cherry pickers.

Fig. 1

ein Ausführungsbeispiel eines erfindungsgemäßen hydraulischen Pumpenaggregats in einer Seitenansicht;

Fig. 2

das hydraulische Pumpenaggregat nach der Fig. 1 in einer Draufsicht von oben;

Fig. 3

einen hydraulischen Schaltplan für das Pumpenaggregat nach den Fig. 1 und 2;

Fig. 4

die im hydraulischen Pumpenaggregat nach den Fig. 1 und 2 verwendete Anschlussvorrichtung in einer vergrößerten, perspektivischen Ansicht;

Fig. 5a bis 5d

die Anschlussvorrichtung nach der Fig. 4 aus unterschiedlichen Blickrichtungen; und

Fig. 6

einen Grundkörper für die Aufnahme der erfindungsgemäßen Anschlussvorrichtung nach den Fig. 4 bis 5d in vier voneinander verschiedenen Schwenkpositionen zur Veranschaulichung der einzelnen Bearbeitungsschritte.

Further advantages and features of the invention result from the figures and the following description of the drawing. The features mentioned above and those listed below can each be realized individually or in any combination on a connection device according to the invention, a hydraulic pump unit according to the invention or a method according to the invention. The features shown in the figures are purely schematic and should not be understood to be to scale. Show it:

1

an embodiment of a hydraulic pump unit according to the invention in a side view;

2

the hydraulic pump unit after the 1 in a plan view from above;

3

a hydraulic circuit diagram for the pump unit according to the Figures 1 and 2 ;

4

in the hydraulic pump unit according to the Figures 1 and 2 used connection device in an enlarged, perspective view;

Figures 5a to 5d

the connection device after the 4 from different perspectives; and

6

a body for receiving the connecting device according to the invention Figures 4 to 5d in four different swivel positions to illustrate the individual processing steps.

1 shows a hydraulic pump unit 10 with a tank unit 12 and a motor unit 14 in a side view 1 seen, in the upper area of the motor unit 14 there is a housing cover 16 with a rectangular inscription field 18 arranged on the right-hand side. The tank unit 12, the motor unit 14 and the housing cover 16 specify the essentially cylindrical shape of the hydraulic pump assembly 10. The pump unit 10 further comprises a connection device 20 which is arranged in the manner of a sandwich on the circumference of its first connection unit 28 between the tank unit 12 with a pump unit 42 accommodated in its tank housing and the motor unit 14 . A filler neck 22 for fluid, such as hydraulic oil, is also arranged on the tank unit 12 and is closed with a cover 14 .

As already explained, the first connection unit 28 of the connection device 20 is arranged between the tank unit 12 with the pump unit 42 and the motor unit 14 and in this respect forms a carrier part for all three units 12 , 14 , 42 . A second connection unit 30 is arranged laterally on the combination of tank unit 12, first connection unit 28 and motor unit 14 and is integrally connected to a radial outer surface of the first connection unit 28, forming the base body of the connection device 20 with the latter. In the 1 the mentioned connection point of the two connection units 28, 30 is covered by the filler neck 22 with cover 24. The electric motor can be connected to a power supply in the usual way by means of two electrical connection points 26a, 26b. The representation of 1 FIG. 12 further illustrates that the first connection unit 28 performs the function of a support part and the second connection unit 30 the function of a control part with valves used. On the second connection unit 30 are valves of the Control part, a pressure relief valve 32, a spring-loaded check valve 34, an electromagnetically actuated directional control valve 36 and a flow control valve 38, 48 are arranged. Furthermore, a measuring device 40 is connected to the control part as a pressure sensor. Said control valves 32, 34, 36, 38 and 48 are inserted into corresponding receptacles of the second connection unit 30 and 1 only partially visible.

the 2 shows the hydraulic pump unit 10 from 1 in top view. The electrical connection means 26a, 26b, the filler neck 22 with the cover 24 and the second connection unit 30 of the Connection device 20 with the control valves 32 to 38 and 48 and the measuring device 40 before. A consumer connection P for supplying a hydraulic consumer (not shown) by the hydraulic pump unit 10 is also provided on the second connection unit 30 .

the 3 shows a circuit diagram of the pump assembly 10 with the usual hydraulic symbols for pertinent circuit diagram representations. The electric motor unit 14 drives the pump unit 42 to deliver fluid from the tank unit 12 to the consumer P. A filter element 44 is arranged between the tank unit 12 and the pump unit 42 . In order to prevent an undesired return flow of fluid from the consumer connection P to the tank unit 12, the check valve 34 is arranged in the fluid line leading from the pump unit 42 to the consumer connection P, and is shown spring-loaded in its closed position directed towards the pump unit 42.

The measuring device 40 measures the fluid pressure present at the consumer connection P and forwards the measured values it determines to a control and computer unit (not shown), which has the electromagnetically actuable Proportional valve 36 drives. In the one valve or neutral position shown, the directional control valve 36 blocks the fluid path between the check valve 34 and the consumer port P to the tank side with the tank unit 12 under the influence of its valve spring. In the further valve position, on the other hand, the directional control valve 36 opens and releases the return flow from the consumer port P to the tank unit 12 .

A flow control valve 38 , 48 is further arranged in the pertinent return between the directional control valve 36 and the tank unit 12 . In a further fluid connection between the pressure supply and the pump unit 42 and the return, the pressure-limiting valve 32 is arranged, via which fluid is fed back into the tank unit 12 in the event of an excessive, impermissible pressure increase. To aerate the tank unit 12, a further filter element 44' with a connected restrictor as a ventilation filter (in the Figures 1 and 2 not shown) connected to form a pertinent outlet 46.

4 shows the connection device 20 in a perspective view, the bores made in these being shown in dashed lines to illustrate the topographies and functions of the two connection units 28, 30. The first connection unit 28 has an essentially plate-shaped topography and a circular cross-section. A circular edge surface 50 is part of a first outer surface 52 of the connection unit 28 , the first outer surface 52 surrounding a central recess 54 which is configured coaxially to the cross section of the connection unit 28 . Two mounting holes 56a, 56b are provided on the first outer surface 52 for mounting the pump unit 42 (cf. 3 ), an opening 58 as a supply or pump connection P and a tank connection T are provided. The first outer surface 52 is formed flat in one plane on the outside of the first connection unit 28 only in the areas surrounding the respective opening 56a, 56b, 58, P, T and on the edge surface 50 . In the other parts of the in 4 shown On the outside, the topography of the first connection unit 28 is provided with a recess.

The opening 58 and the tank connection T each form one end of a connecting bore 60, 60' or a further bore 62, 62'. The bores 60, 60' and 62, 62' each run in the two connection units 28, 30 of the connection device 20. A first bore part 60', 62' is in the first connection unit 28 and a second bore part 60, 62 in the second connection unit 30 formed running and introduced there by machining. The connecting bore 60, 60' serves to supply pressure from the tank unit 12 (cf. 3 ) via the pump unit 42 to be connected to the opening 58 (cf. 3 ) to the consumer connection P, which is provided on the second connection unit 30 . The other bore 62, 62 'is used for a return from the consumer port P to the tank port T, wherein the consumer port P is also the connection point for the return R, as in the hydraulic circuit diagram 3 illustrated. The hydraulic medium flows from P, R via the structural components 74, 62 and 62' to T.

A second outer surface 64 , a third outer surface 66 and a fourth outer surface 68 , a fifth outer surface 78 and a sixth outer surface 80 are formed on the other second connection unit 30 . The second outer surface 64 is arranged at an angle of approximately 45° to the vertical and has the connection point associated with the consumer connection P and the return R as the end of the connecting bore 60, 60'. A further opening 76 for forming the second bore part 62 of the further bore 62, 62' is provided on the third outer surface 66, through which a horizontally arranged first receptacle 70 for a control valve also passes. The machined third outer surface 66 and the unmachined sixth outer surface 80 are each arranged vertically.

at the in 4 shown upper side of the second connection unit 30 are two unprocessed, the fourth and the fifth outer surface 68, 78 arranged horizontally. In this case, the fourth outer surface 68 is arranged in an upper horizontal plane, which essentially corresponds to the plane accommodating the first outer surface 52 of the first connection unit 28, and the fifth outer surface 78 is arranged in a lower horizontal plane. In this respect, the fourth outer surface 68 forms an upper closing surface of the first receptacle 70. In the second connection unit 30, two vertically aligned, second and third receptacles 72, 74 are also formed. These two receptacles 72, 74 pass through horizontal outer surfaces 86, 88 (cf. Figures 5c, 5d ) of the other second connection unit 30.

The ones in the description of 4 The designations mentioned vertically and horizontally refer to the representation shown in the figure. It goes without saying that the installation position of the connecting device 20 and the actual arrangement of the outer surfaces 52, 62, 66, 68, 78, 80, 86, 88 can deviate from the horizontal and the vertical direction. A seventh outer surface 82 is provided on the one first connection unit 28 encircling radially on the outside, which remains unmachined and to this extent forms a possible contact surface for a holding device.

In the Figures 5a to 5d is the in 4 shown enlarged connection device 20 from four different perspectives. the Figures 5a and 5b show according to the 4 , the side assigned to the pump side with the first outer surface 52 of the first connection unit 28. In the representation of FIG Figure 5a the connection device 20 is turned in such a way that the openings formed in the second connection unit 30 are not visible. From the second connection unit 30 are in Figure 5a the unfinished outer surfaces 68, 78 and 80 visible. Figure 5b shows one opposite Figure 5a Representation of the connection device 20 rotated by approximately 180°, so that the openings 70, 76 of the second connection unit 30 formed on the vertical outer surface 66 are clearly visible. through the Central recess 54 in first connection unit 28 is a drive shaft of motor unit 14 (cf. Figures 1 and 3 ) feasible to a pump unit 42 (cf. 3 ) to drive, the pump unit 42 in the tank unit 12 (cf. 1 ) is integrated.

the Figures 5c and 5d show those of the motor unit 14 (cf. 1 ) associated side of the first connection unit 28 and thus the installation position of the connection device 20 in the hydraulic pump unit 10 (cf. Figures 1 and 2 ). In the Figures 5c and 5d Another unmachined, vertically oriented, eighth outer surface 84 and two machined, ninth and tenth outer surfaces 86, 88 of the second connection unit 30 are shown. The second receptacle 72 penetrates through the ninth outer surface 86 and the third receptacle 74 penetrates through the tenth outer surface 88 . while in Figure 5c only the two recordings 72, 74 are visible Figure 5d additionally the first receptacle 70 and the further opening 76 on the third outer surface 66 as well as the consumer connection P to the connection bore 60 on the second outer surface 64 of the other second connection unit 30. The first connection unit 28 has an eleventh outer surface 90 on the pump side, on which fastening holes 56c, 56b and 56e for fastening the motor unit 14 (cf. 1 ) are provided and which has an edge surface 50 ′ for contacting a housing of the motor unit 14 .

6 illustrates the processing steps for producing in the Figures 1, 2 , 4 , 5a to 5d Connection device 20 shown. A pivotable about an axis of rotation R, in 6 The holding device, which is not shown in detail, lies on the unmachined seventh outer surface 82 (cf. 4 ) of the first connection unit 28. The holding device is moved along the axis of rotation R into the four pivot positions shown. In a first pivoting position of the holding device, the first connection unit 28 with the plate-shaped topography is arranged vertically and is machined along a working direction A on the first outer surface 52 . This represents the first processing step B1. In the first processing step B1 the fastening holes 56a, 56b, the opening 58, the tank connection T and the central recess 54 are introduced into the first connection unit 28 on the first outer surface 52. The fourth and fifth outer surfaces 68, 78 of the second connection unit 30, which are also vertically aligned, remain unmachined. Said holding device can be formed by holding or collet chucks or by some other receptacle which, in the fixed state, acts on the ring-shaped outer surface 82 in a detachable manner. If the outer surface 82 is referred to as an unprocessed surface, this does not rule out the possibility of any type of processing being carried out outside of the processing method described, for example also as part of a coating method. The processing cuts B1 to B4 can also be carried out in any order.

In a second pivoting position of the holding device, the first connection unit 28 is aligned horizontally and the second connection unit 30 is machined on the third outer surface 66 . In the second processing step B2, the first receptacle 70 and the further opening 76 and the second bore part 62 of the further bore 62, 62' are introduced into the second connection unit 30 on the third outer surface 66. The working direction A of the second processing step B2 corresponds to that of the first processing step B1.

Starting from the second pivoting position, the holding device is moved further clockwise along the axis of rotation R, approximately through an angle of 45°, this angle corresponding to the inclined position of the second outer surface 64 of the second connection unit 30 in relation to the first outer surface 52 of the first connection unit 28. Due to the third pivoting position selected in this way, the second outer surface 64 is aligned vertically and is machined along the same working direction A in a third machining step B3. In the third processing step B3, the connection point P, R and the second connection bore part 60 of the connection bore 60, 60' introduced into the second connection unit 30.

In the fourth and last pivoting position of the holding device, the first connection unit 28 is again aligned vertically and is machined along the working direction A on the eleventh outer surface 90 . Furthermore, the ninth and the tenth outer surface 86, 88 of the second connection unit 30 are machined in the fourth machining step B4. In the fourth processing step B4, the fastening holes 56c, 56d, 56e are made in the first connection unit 28 on the eleventh outer surface 90 and the second receptacle 72 on the ninth outer surface 86 and the third receptacle 74 on the tenth outer surface 88 in the second connection unit 30.

6 shows that two outer surfaces 52, 90 of the first connection unit 28 and four outer surfaces 64, 66, 86, 88 of the second connection unit 30 are processed in four processing steps B1 to B4. In this case, all processing steps B1 to B4 take place along the horizontally directed working direction A. In particular, it is not necessary to re-clamp the base body arranged in the pivotable holding device for the connecting device 20 along the entire processing sequence. It goes without saying that the metal-cutting machining tools used (not shown) can be moved in relation to the workpiece at least in three infeed axes perpendicular to one another and can obviously be controlled by the machining or machine tool.

Claims (11)

1. Hydraulic connection device, consisting of a main body which has at least two connection units (28, 30) that are provided with different topographies, in the sense of different three-dimensional shapes, and functions and that are connected to each other in one piece, and which main body, designed as a master part or formed part, is at least partially machined on its outer surfaces (52, 64, 66, 68, 78-90),

   wherein the outer surfaces (52, 90) of the one connection unit (28) are arranged on opposing sides of the one connection unit (28) extending at least partially parallel to each other,

   wherein one of the outer surfaces (64, 66) of the other connection unit (30) extends perpendicularly or at a predefinable angle to at least one portion of the machined outer surfaces (52, 90) of the one connection unit (28), and

   wherein a connecting drilled hole (60, 60') serves to supply a consumer (P) with fluid under pump pressure,

   characterised in that

   at least one outer surface (82) of the one connection unit (28) is left unmachined for forming an engagement surface for the engagement of a holding device pivotable about at least one axis (R);

   in that the other connection unit (30) has more machined outer surfaces (64, 66, 86, 88; 52, 90) than the one connection device (28); and

   in that a further drilled hole (62, 62'), at least partially separated from the one connecting drilled hole (60, 60') and branching off therefrom, is used for the return flow of fluid from the consumer (P) to the tank (T).
2. Connection device according to claim 1, characterised in that the topography of the one connection unit (28) is plate-shaped and that of the other connection unit (30) is cuboid, and in that the cuboid topography merges integrally into the other connection unit (30) at a point of the unmachined outer surface (82) of the one connection unit (28) which is left free for possible engagement of the holding device, in such a way that on at least one side the cuboid topography protrudes beyond the plate-shaped topography with a predefinable overhang.
3. Connection device according to claim 2, characterised in that, on its opposing outer surfaces (52, 90), the connection unit (28) with the plate-shaped topography is provided as a functional part for receiving a motor unit (14) or a pump unit (42) which is preferably integrated into a tank unit (12), and in that the other connection unit (30) with the cuboid topography is provided as a functional part for at least partially receiving control valves (32-38, 48).
4. Connection device according to claim 2 or 3, characterised in that the one connection unit (28) with its plate-shaped topography forms an at least partially cylindrical portion of the main body, and in that, concentrically to this cylindrical outer contour and passing through the one connection unit (28), a central recess (54) is provided which is configured such that it can be passed through by a drive shaft of the motor unit (14), preferably an electric motor, for driving the pump unit (42).
5. Connection device according to one of claims 2 to 4, characterised in that connecting drilled holes (60, 60', 62, 62') in the main body extend between the plate-shaped and the cuboid topography and at the point of transition between the two topographies, which drilled holes open with their free ends on the outer surfaces (52, 64, 66) of the respective connection unit (28, 30).
6. Connection device according to claim 5, characterised in that a receptacle (70) for a pressure-limiting valve (32) is provided at a point between the connecting drilled holes of the pressure supply (60, 60') and the return (62, 62'), said receptacle passing through an outer surface (66) of the other connection unit (30) that extends perpendicular to at least one machined outer surface (52, 90) of the one connection unit (28).
7. Connection device according to one of the preceding claims, characterised in that a receptacle (72) for a non-return valve (34) opens into the other connection unit (30) in the connecting drilled hole (60, 60') that is used for the pressure supply, said receptacle passing through an outer surface (86) of the other connection unit (30) which extends parallel to at least one machined outer surface (52, 90) of the one connection unit (28).
8. Connection device according to one of the preceding claims, characterised in that a receptacle (74) for a further valve group (36, 38), which preferably comprises an electromagnetically actuated proportional valve (36), is provided at another point between the connecting drilled holes of the pressure supply (60, 60') and the return (62, 62'), said receptacle passing through the outer surface (86) of the other connection unit (30) which extends parallel to at least one machined outer surface (52, 90) of the one connection unit (28).
9. Connection device according to one of the preceding claims, characterised in that the pressure supply (60, 60') and the return (62, 62') jointly share a connection point (P) which exits at an outer surface (64) of the other connection unit (30) which extends at a predefinable angle, preferably of 45°, to at least one machined outer surface (52, 90) of the one connection unit (28).
10. Hydraulic pump set with a connection device (20) according to one of the preceding claims, characterised in that an electric motor unit (14) is mounted on the one side and a pump unit (42), which is preferably integrated into a tank unit (12), is mounted on the other side of the one connection unit (28), and in that at least one control valve (32-38, 48) for operating the unit (10) is accommodated in the receptacles (70-74) of the other connection unit (30).
11. Method for producing a connection device (20) according to one of claims 1 to 9, characterised in that the one unmachined outer surface (82) of the one connection unit (28) is gripped by means of a holding device which can be pivoted about at least one axis (R) in order, by means of a pivoting operation of at most 180° or greater, to enable machining from only one working direction (A) in at least three, preferably four or more, pivot positions and in the process to machine the outer surfaces (52, 64, 66, 86-90) of both connection units (28, 30) for the subsequent accommodation of a motor-pump unit (14, 42) together with at least one control valve (32-38, 48).

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