EP1952033B1 - Concrete pump vehicle - Google Patents

Abstract

In a hydraulic cylinder (11) for a multiple-part mast superstructure comprising at least two mast arms which are connected in an articulated manner and of which one can be pivoted with respect to the other mast arm by the hydraulic cylinder, it is proposed that the base region (18) of the cylinder container (12) is of curved configuration, which cylinder container (12) is closed in the base region (18) on one side in order to accommodate a piston. In this way, the force flux is improved in the walls of the hydraulic cylinder, with the result that manufacturing which uses less material and is correspondingly less expensive is possible, with a simultaneously reduced overall weight. The hydraulic cylinder according to the invention is suitable, in particular, for use with concrete pumps, cranes, lifting platforms and the like or general apparatuses having mast superstructures, in which hydraulic cylinders are used for pivoting.

Description

The present invention relates to a concrete pump vehicle with a hydraulic cylinder for multi-part mast construction of at least two articulated mast arms, one of which is pivotable by the hydraulic cylinder relative to the other Mastarm, especially for concrete pumps, cranes, lifts and the like, with a closed in a bottom region cylindrical container for receiving a piston.

Furthermore, the present invention relates to a device with mast construction with at least two articulated mast arms, one of which is pivotable by a hydraulic cylinder relative to the other mast arm, in particular for concrete pumps, cranes, lifting platforms and the like.

So-called Mastaufbauten of a plurality of each pairwise articulated mast arms are used for example in the construction industry to promote flowable materials, such as concrete, from a central delivery point to quasi arbitrary processing locations within the reach of the mast construction. To be able to change such a mast structure in its geometry, two mast arms of the mast assembly are each hingedly connected to each other and against each other by a hydraulic cylinder pivoted.

The working machine hydraulic cylinder is in terms of statics a pressure vessel of variable geometry for delivery and absorption of forces. In general, the housing of the hydraulic cylinder, hereinafter also referred to as a cylinder container, formed from a (cylinder) tube with a welded bottom piece. The bottom piece is usually made of a solid cylinder with a transverse bore for a bearing pin, which is provided for securing the hydraulic cylinder to one of the mast arms. Alternatively, the bottom piece may be formed in the form of a disc with welded cross tube as a bolt bearing. Depending on the intended use of the hydraulic cylinder, the corresponding pin eye is narrow and equipped with a spherical bearing, or it reaches the width of the container or projects laterally beyond this. For heavy-duty lightweight cylinders is the bottom piece as a carefully machined disc most highly welded to the cylinder tube. The bolt bearing is also connected in a complex manner with the bottom disc. The formation of the bottom piece as a steel casting improves the stability properties of the solution described above.

From the point of view of the force flow, the above-described conclusion of a (circular) cylindrical container under internal pressure with a disk or flat, d. H. Plan executed bottom part for reasons of power and support weight and notch intensive. In order to avoid associated disadvantages, elaborate weld preparations and back turns are provided in previously known hydraulic cylinders, so that such hydraulic cylinders are material-consuming to manufacture and correspondingly expensive.

Concrete conveyors with generic hydraulic cylinders that are used in concrete pump vehicles, for example, from DE 198 37 900 A1 known.

The invention is based on the object of avoiding the above-mentioned disadvantages to provide a hydraulic cylinder, which can be produced due to an improved power flow with reduced material costs and thus reduced overall weight at the same time at least equivalent or improved stability. In addition, the invention has for its object to provide a device with mast structure, which is characterized over known device of this kind, in particular by a lower total weight and improved movement and stability properties.

This object is achieved with concrete pump vehicle according to claim 1 and in detail in a hydraulic cylinder of the type mentioned in that the bottom portion of the cylinder container is formed curved.

In a device with mast structure of the type mentioned, the object is achieved in that the device has at least one hydraulic cylinder according to the invention for pivoting the mast arms.

Accordingly, the basic idea of the approach according to the invention is to replace the conventionally regularly designed in the form of a disk bottom piece of the hydraulic cylinder by a curved shell, in particular a hemispherical shape represents the optimal shape from a static point of view and correspondingly requires the lowest wall thickness with maximum weight reduction.

In this context, a preferred development of the hydraulic cylinder according to the invention provides that the bottom region is concave with respect to the cylinder container; i.e. arched outwards, is formed, resulting in a particularly favorable flow of power. Alternatively, however, in a further development of the hydraulic cylinder according to the invention, it may be provided that the bottom area is convex, ie. curved inward, is formed.

In order to achieve a uniform loading of the cylinder container in its bottom region, it can further be provided in a hydraulic cylinder according to the invention that the bottom portion has a uniform curvature in section, wherein the bottom portion of a particularly preferred embodiment of the hydraulic cylinder according to the invention as a ball portion, in particular as a hemispherical shell is formed ,

Alternatively, however, it is also possible to form the hydraulic cylinder in the bottom region of the cylinder container with a non-uniform curvature on average. In this case, a further embodiment of the hydraulic cylinder according to the invention provides that the bottom region of the cylinder container is designed as a paraboloid.

In order to further achieve the most uniform possible loading of the hydraulic cylinder according to the invention in its bottom region, it can be provided according to a further embodiment of the hydraulic cylinder according to the invention, that the bottom portion is formed in section symmetrically with respect to a longitudinal axis of the cylinder container.

If the hydraulic cylinder according to the invention is to be used for use with a known Mastarmstruktur, it will be necessary in the bottom region of the cylinder container, a bearing eye in the form of an eye part, i. to provide a component with at least one such bearing eye. In order to achieve a load capacity of the cylinder container in its bottom area by increasing the wall thickness while maintaining the curved shape in this context, provides a particularly preferred embodiment of the hydraulic cylinder according to the invention that the bottom portion on its inside as a spherical section, in particular as a hemisphere, and at its Outside is formed as a paraboloid, resulting in the desired increase in the wall thickness, especially in the apex region of the curvature, so that preferably there a bearing eye (eye part) can be arranged.

In a development of such an embodiment of the hydraulic cylinder according to the invention, it is particularly possible to form the eye part in the form of a narrow rib with spherical plain bearings, whereby a maximum mobility of the hydraulic cylinder is given with respect to the boom arms.

According to a further advantageous embodiment of the hydraulic cylinder according to the invention, the cylinder tube can be extended to the discharge of reaction or bearing forces on the curved floor area out, in the thus gained space, the bearing eyes for the bearing pin can be used to attach the hydraulic cylinder to one of the mast arms. Accordingly, according to an embodiment of the invention of the hydraulic cylinder is provided that the eye portion is formed as a cylindrical container beyond its bottom portion extending annular part having in its mantle two oppositely arranged eye openings for receiving at least one fastening bolt. According to the invention, it is accordingly possible to use either a split bolt with a multi-section connection or a continuous bolt with a two-section connection.

In a concave design of the bottom portion, the above-described extension of the cylinder container beyond the bottom area expediently results by applying an additional ring portion, whereas convex curvature of the bottom portion of this or the corresponding bottom piece itself can be extended downwards beyond the cylinder container, so no further ring part is to be provided.

However, if the total weight of the hydraulic cylinder according to the invention is significantly reduced compared to conventional cylinder designs, a fastening bolt guided outside the pressure range of the hydraulic cylinder requires a relatively large dead length of the cylinder in its bottom area. However, if a corresponding installation space for the hydraulic cylinder available, the bolt eye can also be installed in the pressure range of the hydraulic cylinder and penetrate it. A corresponding preferred development of the hydraulic cylinder according to the invention therefore provides that the eye part is designed as a pin bearing tube passing through the cylinder container.

In order not to impair the available working volume of the hydraulic cylinder, it is provided in a development of the hydraulic cylinder according to the invention that the pin bearing tube is arranged within a volume defined by the bottom region.

In a further development of the hydraulic cylinder according to the invention, it may be provided that the bolt bearing tube covers the bottom region of the cylinder container, i. touched a wall of the cylinder container. In the course of such an embodiment, the cylinder container can be integrally formed in its bottom region as a casting with improved stability properties.

Alternatively, according to a development of the hydraulic cylinder according to the invention, it is also possible to arrange the bolt bearing tube at a distance from the bottom region of the cylinder container. Such a construction has the advantage that the pin bearing tube even after production of the cylinder container by bilateral Opening the latter can be used as a welded construction subsequently in this.

As mentioned above, the bottom portion and the pin bearing tube may be formed together in one piece, in particular as a casting. The connection of this casting to a cylinder tube to form a cylinder container is effected by an annular weld. The seam preparation required for this also includes the formation of the required bath fuse of the weld seam. By virtue of the power flow which is favorable according to the invention, it is possible to leave the bath fuse or to relieve it further by means of an additional relief notch, which is manufactured in one operation with the weld seam preparation. In this way, an additional, complex operation is saved in the course of the present invention, without affecting the quality of the resulting component.

Furthermore, by providing the above-mentioned penetrating tube for the bearing pin (pin bearing tube), it is possible to shift the plunger stop in a hydraulic cylinder according to the present invention to a load favorable range. For this purpose, an extremely preferred development of the hydraulic cylinder according to the invention provides that a stop for the piston is provided on the bolt bearing tube.

Fig. 1

eine schematische Gesamtansicht einer erfindungsgemäßen Vorrichtung mit Mastaufbau in einer Ausgestaltung als Betonpumpenfahrzeug;

Fig. 2

eine schematische Teilansicht des Mastaufbaus der Betonpumpe aus Fig. 1;

Fig. 3

eine teilweise Schnittansicht eines Hydraulikzylinders mit konkav gewölbten Bodenbereich;

Fig. 4

eine teilweise Schnittansicht eines Hydraulikzylinders mit konvex gewölbten Bodenbereich;

Fig. 5

eine erste Ausgestaltung des erfindungsgemäßen Hydraulikzylinders mit außerhalb des Zylinderbehälters angeordnetem Augenteil und geteiltem Befestigungsbolzen;

Fig. 6

eine zweite Ausgestaltung des erfindungsgemäßen Hydraulikzylinders mit außerhalb des Zylinderbehälters angeordnetem Augenteil und geteiltem Befestigungsbolzen;

Fig. 7

Ausgestaltungen des erfindungsgemäßen Hydraulikzylinders gemäß den Figuren 5 und 6, jedoch mit durchgehendem Befestigungsbolzen;

Fig. 8

eine weitere Ausgestaltung des erfindungsgemäßen Hydraulikzylinders mit schmalem Augenteil und Gelenklager;

Figuren 9a, b

eine erste Ausgestaltung des erfindungsgemäßen Hydraulikzylinders mit einem den Zylinderbehälter durchdringenden Bolzengehäuse;

Figuren 10a, b

eine weitere Ausgestaltung des erfindungsgemäßen Hydraulikzylinders mit einem den Zylinderbehälter durchdringenden Bolzengehäuse;

Fig. 11

eine Detailansicht des Hydraulikzylinders gemäß Fig. 10a, b; und

Figuren 12 a-f

detaillierte Ansichten - teilweise im Schnitt - einer weiteren Ausgestaltung des erfindungsgemäßen Hydraulikzylinders.

Further features and advantages of the present invention will become apparent from the following description of exemplary embodiments with reference to the drawing. It shows / shows:

Fig. 1

a schematic overall view of a device according to the invention with mast construction in an embodiment as a concrete pump vehicle;

Fig. 2

a schematic partial view of the mast structure of the concrete pump Fig. 1 ;

Fig. 3

a partial sectional view of a hydraulic cylinder with a concave curved bottom portion;

Fig. 4

a partial sectional view of a hydraulic cylinder with a convex curved bottom portion;

Fig. 5

a first embodiment of the hydraulic cylinder according to the invention with arranged outside the cylinder container eye part and split fastening bolt;

Fig. 6

a second embodiment of the hydraulic cylinder according to the invention with arranged outside of the cylinder container eye part and split mounting bolt;

Fig. 7

Embodiments of the hydraulic cylinder according to the invention according to the FIGS. 5 and 6 , but with a continuous fastening bolt;

Fig. 8

a further embodiment of the hydraulic cylinder according to the invention with a narrow eye part and spherical plain bearings;

FIGS. 9a, b

a first embodiment of the hydraulic cylinder according to the invention with a cylinder housing penetrating the bolt housing;

FIGS. 10a, b

a further embodiment of the hydraulic cylinder according to the invention with a cylinder housing penetrating the bolt housing;

Fig. 11

a detailed view of the hydraulic cylinder according to Fig. 10a , b; and

Figures 12 af

detailed views - partly in section - another embodiment of the hydraulic cylinder according to the invention.

The Fig. 1 shows a device 1 according to the invention with mast assembly 2 in the form of a self-propelled concrete pump. The device 1 has a truck chassis 3 with a cab 4 and a chassis carrier 5, on which a slewing gear 6 for the mast assembly 2 is arranged. The mast assembly 2 itself has a number of articulated mast arms, which will be described below with reference to Fig. 2 is explained. On the chassis 3, according to the exemplary embodiment shown, a concrete pump, not explicitly shown, is furthermore constructed, whose hopper 7, via which the concrete pump is acted upon by a mixer, not shown, is arranged at the rear of the vehicle. On the mast assembly 2, a conveyor, not shown, for the concrete conveyed by the concrete pump is further provided, so that the concrete along the mast structure to any location within the range of unfolded mast assembly 2 can be conveyed.

The Fig. 2 shows a schematic detail view of the mast assembly 2 Fig. 1 in its unfolded state. The mast assembly 2 has at least two mast arms 9, 10 connected to one another via a joint 8, one of which 10 can be pivoted by a hydraulic cylinder 11 relative to the other mast arm 9. For this purpose, the hydraulic cylinder 11 has, in a manner known per se, a substantially tubular cylindrical container 12, in which a piston 13 is slidably received. The cylinder container 12 of the hydraulic cylinder 11 is articulated in a first hinge point 14 on a bearing part 15 of the first mast arm 9, while the piston 13 of the hydraulic cylinder 11 is fastened via a piston rod 16 at a hinge point 17 of the second mast arm 10.

The Fig. 3 shows a partial sectional view of a hydraulic cylinder 11 according to the present invention. Shown is the cylinder container 12 of a hydraulic cylinder 11, according to the embodiment shown in its bottom portion 18 is closed on one side, wherein the bottom portion 18 in the manner of a hemisphere with respect to the interior 19 of the cylinder container 12 concave, that is curved outward, is formed. In the embodiment of Fig. 3 the cylinder container 12 is formed in two pieces from a cylinder tube 20 and a hemispherical bottom piece 21, which are connected via a weld 22. Alternatively, however, the cylinder container 12 may also be formed in one piece, in particular as a cast part.

According to the in Fig. 4 shown embodiment of the hydraulic cylinder according to the invention, the cylinder container 12 is in turn formed from a cylinder tube 20 and a welded bottom piece 21, however, the bottom piece 21 is arranged such that it convex with respect to the interior 19 of the cylinder container 12, ie inwardly curved bottom portion 18th forms.

According to the Fig. 2 the cylinder container 12 of the hydraulic cylinder 11 according to the invention is articulated to a first mast arm 9 of the Mastarmanordnung 2. The Fig. 5 shows a corresponding inventive development of the cylinder container 12 according to the Fig. 3 in that the cylinder container 12 is extended beyond the curved bottom portion 18 by means of an annular eye portion 23. The eye portion 23 has in its mantle diametrically opposite two eye openings 24, 24 ', through which a respective short fastening bolt 25 or 25' is guided, which is used for articulated fastening of the hydraulic cylinder 11 to the mast arm 9 provided on the mast arm pairs of Bearing elements 15, 15 'cooperates. According to a preferred embodiment, the annular eye part 23 is connected to the cylinder container 12 by welding (weld 22).

The Fig. 6 shows a corresponding further development of the hydraulic cylinder 11 according to the invention according to the Fig. 4 , In contrast to the embodiment according to the above-described Fig. 5 is according to the Fig. 6 no additional eye portion 23 is provided, but the bottom piece 21 of the cylinder container 12 is downwards, ie extended at its open end and thus assumes the function of the annular eye portion 23 according to the Fig. 5 , Accordingly, according to the Fig. 6 the bottom piece 21 diametrically opposite eye openings 24, 24 ', in each of which a short fastening bolt 25, 25' is introduced. As shown in Fig. 5 the fastening bolts 25, 25 'in turn cooperate with pairs of bearing elements 15, 15', which according to the Fig. 2 are provided on the mast arm 9.

The Fig. 7 shows alternative embodiments of the above with reference to the FIGS. 5 and 6 Here, in the left part of the Fig. 7 an evolution of the subject matter of Fig. 5 shown, in which instead of two short fastening bolts only a continuous fastening bolt 25 is present, which is guided in a continuous, between the eye openings 24, 24 'extending pin bearing tube 26 in the manner of a pin housing. The right part of the Fig. 7 shows a corresponding configuration in a hydraulic cylinder 11 according to the FIGS. 4 or 6, ie a hydraulic cylinder with a convexly curved bottom area 18.

The Fig. 8 shows a further embodiment of the hydraulic cylinder 11 according to the invention, in which the eye part not as a connecting ring according to the FIGS. 5 to 7 , but as a narrow rib 27 is formed. For this purpose, a narrow, rib-shaped eye portion 27 is arranged in a vertex of the curvature of the curved bottom portion 18 of the cylinder container 12, preferably welded. The eye portion 27 has a perpendicular to a longitudinal axis L of the cylinder container 12 oriented opening 28, in which a hinge bearing 29 is provided. The joint bearing 29 has a continuous fastening bolt 25, which in turn with suitable bearing elements 15, 15 'on the first mast arm 9 of the multi-part mast assembly 2 (FIGS. Fig. 1, 2 ) cooperates. For stability reasons, the cylinder container 12 in its bottom portion 18 on its inner side 30, ie the interior 19 of the cylinder container 12 facing a uniform hemispherical curvature and on its outer side 31, ie the interior 19 of the cylinder container 12 facing away, an uneven, especially parabolic curvature. This leads to a slight thickening of the bottom portion 18 of the cylinder container 12 at the apex of the curvature, in which - as I said - the rib-shaped eye portion 27 is arranged.

As an alternative to the above-described embodiments of the hydraulic cylinder according to the invention with the eye arranged inside the cylinder container, the following show FIGS. 9 to 11 Embodiments of the hydraulic cylinder 11 according to the invention, in which the fastening bolt 25 and the pin bearing tube 26 (see. Fig. 7 ) penetrate the interior 19 of the cylinder container 12.

The FIGS. 9a, b show a cylindrical container 12 of a hydraulic cylinder 11 according to the invention with outwardly curved hemispherical bottom portion 18 (see. Fig. 3 ), in which a bolt bearing tube 26 for a fastening bolt, not shown, penetrates the interior 19 of the cylinder container 12 in a region which is defined (delimited) by the curved bottom region 18 of the cylinder container 12. The cylindrical container 12 and the pin bearing tube 26 may be formed integrally together (eg, as a cast part). Alternatively, a two-piece embodiment of the cylinder container 12 according to the Fig. 3 possible, with only the bottom piece 21 ( Fig. 3 ) and the bolt bearing tube 26 are integrally formed as a casting. Finally, however, a further embodiment is possible in which the cylinder container 12 or its bottom piece 21 (FIG. Fig. 3 ) is opened on both sides, so that subsequently the pin bearing tube 26 as an independent component by the cylinder container 12 feasible and can be welded thereto. It is in accordance with the FIGS. 9a, b the bolt bearing tube 26 is arranged at a minimum distance D from the inner wall 30 of the cylinder container 12 in the bottom portion 18. In the illustrated embodiment, the pin bearing tube 26 has a circular cross-section, such as, for example Fig. 9b However, the invention is not defined therein. Rather, the pin bearing tube 26 may also have a non-circular, approximately rectangular, square, triangular or elliptical cross section. Although in the in the Fig. 9b and 10b illustrated embodiments, the center of the bolt bearing tube 26 is disposed on the longitudinal axis L of the cylinder container, other configurations are possible. For example, in a further advantageous embodiment the center of the bolt bearing tube can be laterally offset by a distance to the longitudinal axis L.

Alternatively, the show FIGS. 10a, b an embodiment of the hydraulic cylinder 11 according to the invention, in which the pin bearing tube 26, the inner wall 30 of the cylinder container 12 is tangent in the bottom portion 18. Preferably, in the course of this embodiment, at least the bottom piece 21 ( Fig. 3 ) of the cylinder container 12 and the pin bearing tube 26 together in one piece (eg, as a cast part).

Such an embodiment of the hydraulic cylinder 11 according to the invention is in the Fig. 11 again detailed by a partial sectional view. According to the Fig. 11 the cylindrical container 12 is composed of a cylinder tube 20 and a bottom piece 21, preferably welded (weld 22), wherein the bottom piece 21 of the cylinder container 12 towards its open end in a region 31 for stability reasons, a thickening and in a wider region 32 on his Inside 27 has a recess. Furthermore, the pin bearing tube 26 is upward trapezoidal, ie extended in the direction of the cylinder interior 19 in section, so that a stop 33 for the inside of the cylinder container 12 movable piston 13 (FIGS. Fig. 2 ), wherein the stopper 33 is preferably located at the level of the recess 32. In the right part of the Fig. 11 In addition, a casting contour of the bottom piece 21 before machining to form the thickening 31 or the recess 32 is additionally shown.

The FIGS. 12a-f show a further embodiment of a bottom piece 21 of a hydraulic cylinder 11 according to the invention (see. Fig. 3 ) in detail based on a number of diverse (sectional) views.

In the Fig. 12a is in the right part of the figure again a casting contour of the bottom piece 21 of a hydraulic cylinder according to the invention shown in section. In the left part of the Fig. 12a is essentially the Fig. 11 appropriate Design of the bottom piece 21 with attached cylinder tube 20 after machining the casting contour (see. Fig. 11 ). In this case, the bottom piece 21 in the apex region of its curvature on an inclined flattening 34, to which - in the radial direction with respect to the longitudinal axis L of the bottom piece 21 offset - a projection 35 with a bore 36 connects. The projection 35 serves as a specially machined flat surface for receiving a connectable to the bore 36 hydraulic valve

The Fig. 12b shows a section along the line AA (see. Fig. 12d ). This illustration shows, in particular in a region 37 of the arched bottom region 18, a radius of curvature R of the arched bottom region 18 decreasing from the outside in the direction of the longitudinal axis L of the bottom piece 21.

The Figures 12c and 12d show a side view and a plan view of the bottom piece 21 according to the FIGS. 12a, b , where the Fig. 12d in particular, an approximately parallel to the circular in plan view outer contour of the bottom piece 21 extending curvature formed as a two-piece projection stop 33 is shown (see also Fig. 12e ).

Finally, the show FIGS. 12e and 12f a sectional view along the line BB in Fig. 12d or a view of the bottom piece 21 viewed from below (arrow X in FIG Fig. 12e ).

How the particular Figures 12d-f show the inventive approach with a penetration of the volume defined by the curved bottom portion 18 of the cylinder container 12, the possibility of a variation of the eye width AB ( Fig. 12d ) with respect to a width ZB ( Fig. 12d ) of the cylinder container 12 to relatively far beyond the latter width ZB addition, wherein the width increase (AB - ZB) is limited solely by the flexural strength of the structure.

Claims (19)

1. Concrete pump vehicle comprising a concrete pump and a multi-part boom structure (2) composed of at least two articulatedly connected boom arms (9, 10), of which one (10) can be pivoted relative to the other boom arm (9) by means of a hydraulic cylinder, wherein the hydraulic cylinder (12) comprises a cylindrical container (12) which is closed on one side in a bottom region (18) and which is intended to accommodate a piston (13) in an inner space (19) of the cylindrical container (12), and an eye part (23) for articulately accommodating a fastening bolt (25) is arranged at the bottom region (18) of the cylinder, said eye part being used to pivotally mount the cylinder on the boom arm (9, 10), characterized in that the bottom region (18), provided with the eye part (23), of the cylindrical container (12) is designed to be curved in the inner space (19).
2. Concrete pump vehicle according to Claim 1, characterized in that the bottom region (18) is designed to be convex with respect to the cylindrical container (12, 19).
3. Concrete pump vehicle according to Claim 1, characterized in that the bottom region (18) is designed to be concave with respect to the cylindrical container (12, 19).
4. Concrete pump vehicle according to one of Claims 1 to 3, characterized in that the bottom region (18) has a uniform curvature (R) in section.
5. Concrete pump vehicle according to one of Claims 1 to 4, characterized in that the bottom region (18) is designed as a spherical segment, in particular as a hemispherical shell.
6. Concrete pump vehicle according to one of Claims 1 to 3, characterized in that the bottom region (18) has a non-uniform curvature (R) in section.
7. Concrete pump vehicle according to Claim 6, characterized in that the bottom region (18) has a paraboloidal design.
8. Concrete pump vehicle according to one of Claims 1 to 7, characterized in that the bottom region (18) is designed, in section, to be symmetrical with respect to a longitudinal axis (L) of the cylindrical container (12).
9. Concrete pump vehicle according to one of Claims 1 to 8, characterized in that the bottom region (18) has different curvatures (R) on its inner side (30) and outer side (31) with respect to the cylindrical container (12, 19).
10. Concrete pump vehicle according to one of Claims 1 to 9, characterized in that the bottom region (18) is designed on its inner side (30) as a spherical segment, in particular as a hemisphere, and on its outer side (31) as a paraboloid.
11. Concrete pump vehicle according to Claim 1, characterized in that the eye part (23) is designed as a narrow rib (27) with a pivot bearing (29).
12. Concrete pump vehicle according to Claim 10, characterized in that the eye part is designed as a ring part (23) which extends the cylindrical container (12) beyond the bottom region (18) and which has two mutually oppositely arranged eye openings (24, 24') in its shell for accommodating at least one fastening bolt (25, 25').
13. Concrete pump vehicle according to Claim 10, characterized in that the eye part (23) is designed as a bolt-mounting tube (26) which passes through the cylindrical container (12).
14. Concrete pump vehicle according to Claim 13, characterized in that the bolt-mounting tube (26) is arranged within a volume defined by the bottom region (18).
15. Concrete pump vehicle according to Claim 13 or 14, characterized in that the bolt-mounting tube (26) is in contact with the bottom region (18).
16. Concrete pump vehicle according to Claim 13 or 14, characterized in that the bolt-mounting tube (26) is arranged at a distance (D) from the bottom region (18).
17. Concrete pump vehicle according to one of Claims 13 to 16, characterized in that the bottom region (18) and the bolt-mounting tube (26) are jointly designed in one piece.
18. Concrete pump vehicle according to one of Claims 13 to 17, characterized in that a limit stop (33) for the piston (13) is provided on the bolt-mounting tube (26).
19. Concrete pump vehicle according to one of the preceding claims, characterized in that at least one component which is sensitive to mechanical stresses, such as a lock valve block, is integrated into the bottom region (18).

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