DE102021001083B4 - Hydraulically steered transport vehicle, preferably with variable width and track width - Google Patents

Abstract

Transport vehicle which has a chassis (3) with at least two active steering axles (10a, 10b), the chassis (3) comprising at least two chassis parts (4a, 4b), each of which has a row of running gears (10a, 10b; 10a ', 10b') each with at least one wheel rotary arrangement (11a, 11b; 11a', 11b'), which can preferably be adjusted transversely to a vertical longitudinal center plane of the transport vehicle (1), wherein on a transverse side of the transport vehicle (1) a Coupling device (20) with a coupling element (21) mounted in the coupling device (20) so as to be pivotable about an axis, by means of which the transport vehicle (1) can be coupled to a towing or pushing vehicle moving it, the coupling device (20) having at least four Has control cylinder (30a-30d), characterized in that at least two control cylinders (30a, 30c) with their ring-side end via piston rods (31a, 31c) on a first side of the pivotable coupling element (21) and with its piston-side end to the coupling device (20) and at least two control cylinders (30b, 30d) with their ring-side end via piston rods (31b, 31d) to a second side of the pivotable coupling element (21) and with its piston-side end are connected to the coupling device (20), that the two first running gears (10a, 10a ') and the two second running gears (10b, 10b') each have a steering cylinder (40a, 40b; 40c, 40d), each having a first steering cylinder (40a or 40c) on a first wheel turning assembly (11a or 11b) and a second steering cylinder (40b or 40d) on a second wheel turning assembly (11a' or . 11b') in such a way that one end of the corresponding steering cylinder (40a-40d) on the piston side is connected to the chassis (3) and one end on the ring side is connected to a steering unit (14 or 14') via a corresponding piston rod (41). of the corresponding pair of wheel rotation arrangements (11a, 11a', or 11b, 11b'), and that in each case a piston-side connection opening (32a-32d) of a control cylinder (30a-30d) communicates with a piston-side connection opening (42a-42d) of the steering cylinder (40a-40d) assigned to this control cylinder (30a-30d) and a ring-side connection opening (43a-43d) of this steering cylinder (40a-40d) with a ring-side connection opening (33a-33d) of this control cylinder (30a-30d) via corresponding hydraulic lines ( 35a-35d, 36a-36d). is.

Description

The invention relates to a transport vehicle according to the preamble of claim 1.

the DE 10 2012 024 247 B4 the applicant describes a transport vehicle with variable width and track width, which has a chassis with at least one steering axle. The chassis comprises two chassis parts, each of which carries a row of wheel bogies arranged one behind the other and can be adjusted transversely to a vertical longitudinal center plane of the transport vehicle. The wheel bogies of each chassis section are connected by longitudinal tie rods. Between the two rows of wheel bogies there is only one length-adjustable cross tie rod, which connects two wheel bogies from one or more of the steering axles and whose length can be adjusted by an amount corresponding to the increase or decrease in width and track width. The cross tie rod connects two steering arms, each of which is articulated between two adjacent wheel bogies on one of the two chassis parts. In order to adjust the width and the track width of the transport vehicle known from the aforementioned publication, it is necessary to design the transverse tie rod to be adjustable in length and to adjust its length whenever the width of the known vehicle changes.

From the generic claiming the priority of the aforementioned patent DE 20 2013 011 633 U1 it is also known to use a drawbar in the transport vehicle described above, which drawbar is coupled to the chassis of the transport vehicle. For this purpose, the drawbar includes a coupling part that can be rigidly connected to a coupling element of the chassis. This coupling part comprises two elements pivoting with respect to one another about a vertical pivot axis, and four hydraulic cylinders arranged in pairs between the aforementioned elements on either side of the median longitudinal plane of the transport vehicle. The first element of these two aforementioned elements can be pivoted about an axis parallel to the ground in relation to a drawbar part of the drawbar. The second of the two aforementioned elements comprises a vertical plate which can be brought into abutment against the front face of the coupling element of the chassis and can be coupled to the coupling element by screwing. The hydraulic cylinders each have a piston rod articulated on the first element and a cylinder tube articulated on the second element. After coupling, the hydraulic cylinders are hydraulically connected to a hydraulic steering circuit of the steering axles of the transport vehicle, in order in this way to ensure a desired steering angle of the drawbar between the two aforementioned elements.

From the US 4,221,398A a transport vehicle in the form of a drawbar trailer and a low-loader with several steering axles is known, the width and track width of which can be increased or decreased as required by using two chassis parts, each carrying a row of wheel bogies, transverse to the direction of travel or to a vertical one Be moved together or apart longitudinal center plane of the transport vehicle. The wheel bogies of each steering axle are steered there independently of one another by means of separate steering cylinders which are arranged in each of the two chassis parts. As a result, however, an excessive number of steering cylinders are required for the steering and it cannot be guaranteed that the steering angle of the two wheel bogies of each steering axle and thus the steering angle of the associated wheels or wheel pairs are identical during steering.

To steer the two wheel bogies of the two chassis parts, two control cylinders are provided, the piston-side end of which is arranged on the corresponding chassis part and the ring-side end on a pivotable cross member connecting the two chassis parts. A pivoting movement of the drawbar thus causes a cylinder of one of the two control cylinders to be extended and the other cylinder to be retracted. The two control cylinders are each connected to corresponding steering cylinders via hydraulic lines. A piston-side end of each of the two steering cylinders is articulated to the corresponding chassis part and a ring-side end of these steering cylinders is respectively connected to a first end of a steering lever, each of these two steering levers being connected via its second end to the corresponding wheel rotating assembly. A first hydraulic line of the left control cylinder in the direction of travel leads from the piston-side output of this cylinder to a piston-side input of the right steering cylinder in the direction of travel. In a corresponding manner, a piston-side output of the right-hand control cylinder is connected to a piston-side input of the left-hand steering cylinder. Another hydraulic line leads from the ring-side outlet of the left steering cylinder to the ring-side inlet of the right steering cylinder. In addition to the steering axle described above, the known transport vehicle also has a central steering axle and a rear steering axle, each with a rotary wheel arrangement. The steering arm of each chassis part of the front steering axle is connected via a longitudinal tie rod to a first end of a steering arm of the central steering axle and the respective second ends of these steering arms are mechanical cal connection coupled to the corresponding wheel rotating assembly. A third longitudinal tie rod each leads from the second of these two steering levers to a first end of the two levers of the steering axle, which in turn are mechanically connected to the wheel rotary assemblies of the rear steering axle via corresponding tie rods. In each case a second end of the two steering levers of the rear steering axle is connected to a piston rod of further steering cylinders, the respective other end of which is connected to a rear cross member. Another hydraulic line leads from the ring-side output of the left control cylinder to the ring-side input of the right rear steering cylinder and in a corresponding manner a ring-side output of the front right control cylinder is connected to a ring-side input of the left rear steering cylinder. Another hydraulic line connects the piston-side outputs of these two steering cylinders. The disadvantage of this known steering system is that with the measures described in the aforementioned publication, only one steering circuit can be formed, which can only generate a small steering force.

It is therefore the object of the present invention to further develop a transport vehicle of the type mentioned at the outset in such a way that a simple design of the transport vehicle according to the invention provides steering with at least two separate steering circuits with a higher steering force.

This object is achieved by a generic transport vehicle in that at least two control cylinders are connected with their ring-side end via piston rods to a first side of the pivotable coupling element and with their piston-side end to the coupling device and at least two control cylinders with their ring-side end via piston rods to a second side of the pivotable coupling element and are connected to the coupling device with their piston-side end, that the first running gear and the second running gear each have a steering cylinder, with a first steering cylinder being articulated on a first wheel rotating assembly and a second steering cylinder being articulated on a second wheel rotating assembly, such that in each case a piston-side end of the corresponding steering cylinder is connected to the chassis and a ring-side end acts on the steering element of the corresponding wheel rotating assembly via a corresponding piston rod, and that each s a piston-side connection opening of a control cylinder is connected to a piston-side connection opening of the steering cylinder assigned to this control cylinder and a ring-side connection opening of this steering cylinder is connected to a ring-side connection opening of this control cylinder via corresponding hydraulic lines.

The measures according to the invention have the advantage that this creates a steering device for a transport vehicle with at least two active steering circuits, which is also characterized in that an increased steering force is achieved in a simple manner. The measures according to the invention have the effect that the piston-side outputs of the control cylinders are always connected to the piston-side inputs of the corresponding steering cylinders; the active chassis is steered via the piston surface of the control cylinder and the steering cylinder. As a result, the maximum hydraulic and thus also mechanical steering force to be applied is achieved in an advantageous manner. The advantage here is that the ring surfaces of the control cylinders and the ring surfaces of the steering cylinders are connected, which results in stabilization and synchronization of the respective steering circuit. A further advantage is that the measures according to the invention form a dual-circuit steering system which is characterized by increased steering safety. B. the piston-side hydraulic connection between a steering cylinder and a control cylinder is interrupted, the steering unit is still held by the ring-side hydraulic connection. A breaking out of the transport vehicle due to such a defect is therefore effectively counteracted. The transport vehicle according to the invention may therefore (according to the legal regulations currently in force in Germany) be driven at a speed of up to 80 km/h. A further advantage is that the coupling device does not have to be attached directly to the transport vehicle and mechanically connected to the steering that moves the running gear of this transport vehicle. The described hydraulic control of the steering can between the coupling device and the chassis of the transport vehicle according to the invention in an advantageous manner z. B. adapters or side members without integrated steering are coupled and bridged by means of suitable hydraulic lines in order to reach the steering hydraulics of the transport vehicle. A further advantage of the measures according to the invention is that the steering device according to the invention is advantageously suitable for transport vehicles with a fixed width and, in particular, for transport vehicles with a variable width.

An advantageous development of the invention provides that at least one arranged on a first side of the chassis control cylinder of the steering of the transport vehicle according to the invention with a on the same side of the Fahrge Stells arranged steering cylinder is hydraulically connected.

A further advantageous development of the invention provides that the transport vehicle according to the invention is variable in terms of its width and/or its track gauge. According to an advantageous development of the invention, this is achieved in that the two chassis parts can be displaced in the transverse direction relative to one another.

Further advantageous developments of the invention are the subject matter of the dependent claims.

• 1 eine perspektivische Darstellung eines Ausführungsbeispiels eines Transportfahrzeugs,
• 2 eine Draufsicht auf das Ausführungsbeispiel der 1,
• 3 eine Draufsicht auf den vorderen Teil des Transportfahrzeugs der 1 und 2 ohne Transportfläche in einer ersten Stellung einer Zuggabel,
• 4 eine Draufsicht auf den vorderen Teil des Transportfahrzeugs der 1 und 2 ohne Transportfläche in einer zweiten Stellung der Zuggabel,
• 5 eine perspektivische Ansicht eines Zuggabelkupplungselements,
• 6 eine Draufsicht auf das Zuggabelkupplungselement der 5,
• 7 eine Vorderansicht des Zuggabelkupplungselements der 5,
• 8 eine Seitenansicht des Zuggabelkupplungselements,
• 9 und 10 eine schematische Darstellung einer ersten Variante der beiden Lenkkreisläufe des Transportfahrzeugs,
• 11 eine schematische Darstellung einer zweiten Variante der beiden Lenkkreisläufe des Transportfahrzeugs, und
• 12 eine schematische Darstellung der Lenkanordnung bei einem verbreiterten Transportfahrzeug.

Further details and advantages of the invention can be found in the exemplary embodiment, which is described below with reference to the figures. Show it:

• 1 a perspective view of an embodiment of a transport vehicle,
• 2 a plan view of the embodiment of FIG 1 ,
• 3 a plan view of the front part of the transport vehicle 1 and 2 without a transport surface in a first position of a drawbar,
• 4 a plan view of the front part of the transport vehicle 1 and 2 without transport surface in a second position of the drawbar,
• 5 a perspective view of a drawbar coupling element,
• 6 a plan view of the drawbar coupling element 5 ,
• 7 a front view of the drawbar coupling element of FIG 5 ,
• 8th a side view of the drawbar coupling element,
• 9 and 10 a schematic representation of a first variant of the two steering circuits of the transport vehicle,
• 11 a schematic representation of a second variant of the two steering circuits of the transport vehicle, and
• 12 a schematic representation of the steering arrangement in a widened transport vehicle.

In the 1 until 4 1 shows an exemplary embodiment of a transport vehicle, generally designated 1, which has two vehicle modules 2a and 2b that are mechanically coupled to one another. Each of the two vehicle modules 2a, 2b has a number of chassis 10, with at least two and as - active - chassis 10a, 10a 'and 10b, 10b' are formed. The person skilled in the art is clear from the following description that the steering discussed below is not limited to the 1 and 2 shown configuration of the transport vehicle 1 with two mechanically coupled vehicle modules 2a and 2b is limited. Rather, it is also possible to have more than two vehicle modules 2a, 2b or - as in the 3 and 4 shown - to provide only a single vehicle module 2a. It is only necessary that the overall transport vehicle 1 has at least two actively steered chassis 10a, 10a' and 10b, 10b', whereby it is not necessary for the actively steered chassis 10a, 10a', 10b, 10b' to be same vehicle module 2a, 2b are arranged. In the exemplary embodiment described, it is assumed, for example, that the first running gears 10a and 10a' of the first vehicle module 2a are the or one of the front axle lines and the second actively steered running gear 10b, 10b' are the or one of the rear axle lines of the first vehicle module 2a. Of course, it is also possible for the actively steered chassis 10b, 10b' to be one of the axis lines of the second vehicle module 2b, e.g. B. the or one of the rear axle lines of the second vehicle module 2b.

Each of the two vehicle modules 2a, 2b is preferably adjustable in terms of its width and thus track width, it also being noted here that this adjustability of at least one of the two vehicle modules 2a, 2b is advantageous but not absolutely necessary. In the following it is assumed that the vehicle modules 2a, 2b have a variable width and track width. It is readily apparent to those skilled in the art what changes to make if this benefit is not to be realized, i. H. if one or more vehicle modules 2a, 2b are non-variable in terms of their width and track width.

For this purpose, it is provided that a chassis 3 of one or both vehicle modules 2a, 2b has a first and a second chassis part 4a and 4b, which can be changed in a manner known per se in terms of their distance, so that a corresponding sliding movement in a transverse to the vehicle longitudinal direction, the distance between the two chassis parts 4a, 4b can be changed to each other. This can e.g. B. by cross members, as in the DE 10 2012 024 247 B4 described, or by a scissors connection, such as. B. in the DE 10 2014 009 036 B4 explained, happened. In the exemplary embodiment described, provision is made for an intermediate carrier 5 of appropriate width to be placed between the two chassis parts 4a, 4b is used selbar. This intermediate support 5 also has the advantage that it reinforces the chassis 3 and thus ensures that the chassis is considerably more rigid. This advantageously makes it possible to transport higher payloads with the described transport vehicle 1 than is the case with a vehicle that does not have such a construction.

A coupling device 20--here a drawbar coupling device--with a steering element, here with a drawbar 21, is provided on a front transverse side of the chassis 3 of the vehicle module 2a, which will be discussed in detail below. A drive device 7 is coupled to a rear transverse side of the second vehicle module 2b, which is also known and is therefore not explained in any more detail.

the 3 and 4 For reasons of clarity, FIG. 1 only shows the first vehicle module 2a, the second vehicle module 2b is structured accordingly. You can tell from the 3 and 4 that the two active chassis 10a, 10a 'and 10b and 10b' and all other chassis 10 - passive - are designed steerable. Each bogie 10, 10a, 10a', 10b, 10b' has a respective wheel pivot assembly 11a, 11a' and 11b, 11b', the first wheel pivot assemblies 11a, 11b being rotatable in the first chassis part 4a and the second wheel pivot assemblies 11a', 11b' is arranged in the second chassis part 4b. The design of such wheel rotating assemblies 11a-11b' is known and therefore does not need to be described in more detail. Each wheel rotation arrangement 11a, 11b or 11a', 11b' has a steering element 12a or 12b, preferably designed as a steering lever, with the steering elements 12a and the steering elements 12b of the first and second chassis parts 4a and 4b each being connected by longitudinal tie rods 13a and 13b are connected to each other. Such a construction is in the DE 10 2012 024 247 B4 described and therefore does not have to be explained in detail either.

In order to convert a pivoting movement of the drawbar 21 into a pivoting and thus steering movement of the rotary wheel assemblies 11a-11b', it is provided in the exemplary embodiment described that - as described below - the drawbar 21 acts on control cylinders 30a-30d of the coupling device 20 and this control cylinder 30a-30d over into the 9 until 11 hydraulic lines shown and described in more detail below are connected to steering cylinders 40a-40d articulated on the chassis parts 4a, 4b. The control cylinders 30a-30d are explained below with reference to the description of the coupling device 20. How from the 3 and 4 As can be seen, the first steering cylinder 40a, which is articulated at the piston-side end on the first chassis part 4a, acts on the ring side on a first side of a first steering element 14a, designed here as a steering plate, of a steering unit 14, which connects to the steering element 12a, designed here as a steering lever, of the wheel rotating assembly 11a of the first chassis 10a is connected via a longitudinal tie rod 13a and to the steering element 12a of the adjacent rotary wheel arrangement 11a via a further longitudinal tie rod 13a. In a corresponding manner, the steering cylinder 40b, which is also articulated with its piston-side end to the second chassis part 4b, acts on a second side of the steering element 14a of the steering unit 14 and via a longitudinal tie rod 13b on the steering element 12b of the chassis 10a'. In a corresponding manner, the ring-side ends of the third and fourth steering cylinders 40c and 40d each engage on one side of a steering element 14b, embodied here as a steering plate, of a further steering unit 14' on the steering elements 12a and 12b of the rotary wheel assemblies 11a and 11b of the second chassis 10b, 10b'.

The control of this steering cylinder 40a-40d is now carried out by the control cylinder 30a-30d of the coupling device 20, which in the 5 until 8th is shown. The coupling device 20 has a crossbar 23 which can be fastened to the chassis 3 via two coupling elements 24a and 24b. Furthermore, a coupling device 25 known per se and therefore not described in detail is provided, to which the drawbar 21 can be fastened and pivoted along a joint 26 . The first control cylinder 30a is articulated on the piston side on the crossbeam 23 and engages the coupling device 25 with its piston rod 31a. In a corresponding manner, the second control cylinder 30b is in turn articulated with its piston-side end on the crossbeam 23 and its piston rod 31b is connected to the coupling device 25 in an articulated manner. The other control cylinders 30c and 30d in turn engage with their piston-side ends on the crossbeam 24 and their piston rods 31c and 31d are articulated on the coupling device 25 . Each control cylinder 30a-30d has a piston-side connection opening 32a-32d and a ring-side connection opening 33a-33d, at which the in the 9 until 11 hydraulic lines shown are connected, which run to the steering cylinders 40a-40d as described below: In 9 a first variant is shown, which is characterized in that the running gears 10a, 10a' of the first axle line and the other running gears 10 coupled to these via longitudinal tie rods 13a, 13b and the running gears 10b, 10b' and the running gears 10b, 10b' connected to these running gears 10b, 10b' About the second longitudinal tie rods 13a ', 13b' coupled chassis 10 - as from the 10 evident - in are deflected in opposite directions of rotation. The piston-side connection opening 32a of the first control cylinder 30a is connected via a hydraulic line 35a to a piston-side connection opening 42a of the steering cylinder 40a. In a corresponding manner, the piston-side connection opening 32b of the second control cylinder 30b is connected via a hydraulic line 35b to a piston-side connection opening 42b of the steering cylinder 40b. The ring-side connection opening 33a or 33b of the first or second control cylinder 30a or 30b is connected to a ring-side connection opening 43a or 43b of the steering cylinder 40a or 40b via a hydraulic line 36a or 36b. In a corresponding manner, the piston-side connection openings 32c and 32d of the control cylinders 30c and 30d are connected via hydraulic lines 35c, 35d to the piston-side connection openings 42c, 42d of the steering cylinders 40c and 40d of the running gears 10b and 10b'. The ring-side connection openings 33c and 33d of the control cylinders 30c and 30d are connected via hydraulic lines 36c and 36d to the ring-side connection openings 43c, 43d of the steering cylinders 40c, 40d.

If now the drawbar 21 - as in the 3 and 4 shown - from their middle, neutral position (see 3 ) to their left position, seen in the direction of travel (see 4 ) is deflected, the piston rods 31a and 31c of the control cylinders 30a and 30c are retracted, so that a hydraulic medium flowing in the hydraulic lines 35a or 35c emerges from the piston-side connection openings 32a or 32c and in each case via a corresponding hydraulic line 35a or 35c to the Piston-side connection openings 42a and 42c of the steering cylinder 40a and 40c flows. This causes the piston rods 41 of the steering cylinders 40a and 40c to be extended, so that the wheel rotary assembly 11a of the chassis 10a and thus the wheel rotary assemblies 11a' of the chassis 10a' second chassis part 4b - as shown in FIGS 4 and 10 can be seen - rotated anti-clockwise. At the same time, hydraulic medium flows via the ring-side connection openings 33a and 33c of the steering cylinders 40a and 40c via corresponding hydraulic lines back to the ring-side connection openings 33a and 33c of the first and third control cylinders 30a and 30c.

The piston rods 41 of the steering cylinders 40b and 40d are - as from a comparison of 9 and 10 can be seen - retracted. The wheel turning assemblies 11b and 11b' of the bogies 10b and 10b' thus pivot in a clockwise direction, ie in the opposite direction to the direction of rotation of the bogies 10a and 10a'.

Since - as described above - a first group of running gears 10 are connected to the steering elements of the running gears 10a, 10a' via longitudinal tie rods 13a, 13a', the running gears 10 of this first group of running gears 10 also pivot in the same direction as the pivoting and thus steering movement of the running gears 10a, 10a'. This applies in a corresponding manner to the running gears 10 to be assigned to a second group of running gears 10, which are connected to the running gears 10b, 10b' via longitudinal tie rods 13b, 13b'.

If the drawbar 21 is now pivoted in its opposite direction, ie to the right as viewed in the direction of travel, the flow conditions are reversed in a corresponding manner. This is clearly evident to the person skilled in the art and therefore does not need to be described in more detail.

In the transport vehicle 1 described, provision is made for each pair of interacting control cylinders and steering cylinders 30a, 40a or 30b, 40b to form a first steering circuit or 30c, 40c or 30d, 40d to form a second steering circuit. This has the advantage that in this way increased steering forces can be achieved in a simple manner compared to the transport vehicles known from the prior art.

In 11 a second variant of the design of the two steering circuits of the transport vehicle 1 is shown. As can be seen from this figure, the design of the steering circuits described below means that the running gears 10 of the first group of running gears, i.e. those running gears 10 which are connected to the actively steered running gears 10a, 10a' via longitudinal tie rods 13a, 13b, and the second group of running gears 10, ie those running gears 10 which are connected to the actively steered running gears 10b, 10b' via longitudinal tie rods 13a', 13b', are deflected in the same direction when the drawbar 21 pivots.

How out 11 can be seen, the routing of the hydraulic lines of the first steering circuit corresponds to that in FIGS 9 and 10 illustrated first variant. In the second variant according to 12 the routing of the hydraulic lines of the second steering circuit is then “mirrored”: the hydraulic lines coming from the control cylinders 30c, 30d are now not routed to the steering cylinders 40c or 40d arranged on the same side of the transport vehicle 1. The hydraulic lines of the control cylinder 30c are routed to the corresponding ports of the steering cylinder 40d and the hydraulic lines of the control cylinder 30c are routed to the steering cylinder 40c.

the 12 FIG. 1 shows a particularly advantageous embodiment of the steering elements 14a and 14b, designed as steering plates, of the first and second steering units 14 and 14′, respectively, which enables the width of the transport vehicle 1 to be adjusted easily. It is envisaged that the steering elements 14a and 14b not - as in the schematic representations of 9 until 11 - Are made in one piece, but that the steering elements 14a and 14b each have two separate steering element parts 14a', 14a" and 14b', 14b" which are each connected by a cross tie rod 15. By simply changing the length of the cross tie rods 15, the width of the transport vehicle 1 and consequently the track width can be easily adjusted.

In the description described above, it is assumed that the transport vehicle 1 is variable in terms of its width and its track width, in that the two chassis parts 4a and 4b can be displaced in the transverse direction relative to one another. From the above description, however, it is clear to a person skilled in the art that the steering system described can be used not only in transport vehicles 1 with variable widths.

In summary, it can be stated that the measures described create a steering device for a transport vehicle 1 with at least two active steering circuits that is suitable in particular for transport vehicles with variable widths, but is not limited thereto, and which is characterized in that an increased steering force is achieved in a simple manner becomes. This is achieved in an advantageous manner in that a separate hydraulic circuit is designed for each active steering circuit, ie both for the running gears 10a, 10a' and for the running gears 10b, 10b'. This is accomplished by having a pair of cooperating steering cylinders 30a and 30b and 30c and 30d supply hydraulic fluid to only one pair of cooperating steering cylinders 40a and 40b and 40c and 40d.

Claims (10)

Transport vehicle which has a chassis (3) with at least two active steering axles (10a, 10b), the chassis (3) comprising at least two chassis parts (4a, 4b), each of which has a row of running gears (10a, 10b; 10a ', 10b') each with at least one wheel rotary arrangement (11a, 11b; 11a', 11b'), which can preferably be adjusted transversely to a vertical longitudinal center plane of the transport vehicle (1), wherein on a transverse side of the transport vehicle (1) a Coupling device (20) with a coupling element (21) mounted in the coupling device (20) so as to be pivotable about an axis, by means of which the transport vehicle (1) can be coupled to a towing or pushing vehicle moving it, the coupling device (20) having at least four Control cylinder (30a-30d) has, characterized in that at least two control cylinders (30a, 30c) with their ring-side end via piston rods (31a, 31c) on a first side of the pivotable coupling element (21) and with its piston-side end to the coupling device (20) and at least two control cylinders (30b, 30d) with their ring-side end via piston rods (31b, 31d) to a second side of the pivotable coupling element (21) and with its piston-side end are connected to the coupling device (20), that the two first running gears (10a, 10a ') and the two second running gears (10b, 10b') each have a steering cylinder (40a, 40b; 40c, 40d), each having a first steering cylinder (40a or 40c) on a first wheel turning assembly (11a or 11b) and a second steering cylinder (40b or 40d) on a second wheel turning assembly (11a' or . 11b') in such a way that one end of the corresponding steering cylinder (40a-40d) on the piston side is connected to the chassis (3) and one end on the ring side is connected to a steering unit (14 or 14') via a corresponding piston rod (41). of the corresponding pair of wheel rotation arrangements (11a, 11a', or 11b, 11b'), and that in each case a piston-side connection opening (32a-32d) of a control cylinder (30a-30d) communicates with a piston-side connection opening (42a-42d) of the steering cylinder (40a-40d) assigned to this control cylinder (30a-30d) and a ring-side connection opening (43a-43d) of this steering cylinder (40a-40d) with a ring-side connection opening (33a-33d) of this control cylinder (30a-30d) via corresponding hydraulic lines ( 35a-35d, 36a-36d). is. transport vehicle claim 1 , characterized in that at least one control cylinder (30a, 30c; 30b, 30d) arranged on a first side of the chassis (3) is hydraulically connected to a steering cylinder (40a, 40c; 40b, 40d) arranged on the same side of the chassis (3). connected is. Transport vehicle according to one of the preceding claims, characterized in that at least one steering element (12a; 12b) of a row of wheel turning assemblies (11a; 11b) is connected via a longitudinal tie rod (13a; 13b) to a wheel turning assembly (11a; 11b) of another Chassis (10) is connected. Transport vehicle according to one of the preceding claims, characterized in that the first running gears (10a, 10a') the front or one of the front axle lines and/or the second Running gear (10b, 10b') is the rear or one of the rear axle lines of the chassis (3) of the transport vehicle (1). Transport vehicle according to one of the preceding claims, characterized in that the transport vehicle (1) has a first group of running gears (10) which are connected to one another via longitudinal track rods (13a, 13b) with the first running gears (10a, 10a'), and/ or that the transport vehicle (1) has a second group of running gears (10) which are connected to the second running gears (10b, 10b') via further longitudinal tie rods (13a', 13b'). Transport vehicle according to one of the preceding claims, characterized in that at least one further steering element (14a, 14b) is provided, on which the piston rod (41) of a steering cylinder (40a-40d) acts, and that at least two wheel rotating assemblies (11a; 11b ) are connected to the further steering element (14a; 14b) via at least two longitudinal tie rods (13a; 13b). Transport vehicle according to one of the preceding claims, characterized in that the coupling device (20) is arranged detachably on the chassis (3). Transport vehicle according to one of the preceding claims, characterized in that the transport vehicle (1) has a first vehicle module (2a) and at least one second vehicle module (2b) mechanically coupled to this, and that at least two running gears (10a, 10a') in the first vehicle module (2a) and at least two running gears (10b, 10b') are arranged in the second vehicle module (2b). Transport vehicle according to one of the preceding claims, characterized in that the transport vehicle (1) is designed to be variable in terms of its width and/or its track gauge. transport vehicle claim 9 , characterized in that the distance between the first chassis part (4a) and the second chassis part (4b) of the transport vehicle (1) can be changed.

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