DE202019102578U1 - Transport vehicle with two sprung rear axles - Google Patents

Abstract

A motor vehicle (100) comprising a chassis (10), a front axle (11), a first rear axle (20) carried by first axle beams (21) and a second rear axle (30) supported by second axle beams (31) , in which:
- The first axle carrier (21) has a first bearing (12.1) for coupling the first axle carrier (21) to the chassis (10), a second bearing (12.2) for coupling the first axle carrier (21) to the first rear axle (20) and a third bearing (12.3) for coupling the first axle carrier (21) to a spring element (24),
- The second axle (31) has a first bearing (31.1) for coupling the second axle carrier (31) to the chassis (10), a second bearing (31.2) for coupling the second axle carrier (31) to the second rear axle (30) and a third bearing (31.3) for coupling the second axle carrier (31) to a spring element (34),
- The first rear axle (20) for a load (T1) and the second rear axle (30) for a load (T2) provided, characterized in that
the load (T1) of the first rear axle (20) is different from the load (T2) of the second rear axle (30),
- The bearings (21.1, 21.2, 21.3) of the first rear axle (20) and the bearings (31.1, 31.2, 31.3) of the second rear axle (30) on the axle beams (21, 31) are arranged such that from the payloads (T1 , T2) resulting loads each other corresponding loads in the spring elements (24, 34) cause.

Description

Known motor vehicle manufacturers, such as Volkswagen, Mercedes and MAN, offer motor vehicle chassis (hereinafter: chassis), which are provided by so-called body manufacturers with special bodies. Such chassis include as essential components a chassis, a front axle, at least a rear axle, a driver's cab and a motor.

An example of such a chassis is the VW Crafter, which is a pickup truck from Volkswagen AG. Thanks to its low weight, the VW Crafter is also well suited for heavy bodies or high payloads. In addition, preparations from the factory simplify the equipment for special bodies. The special superstructures may, for example, be towing platforms, box bodies, fire brigade structures, etc. Similar chassis from other manufacturers are the MAN-TGE and the Mercedes-Benz Sprinter.

As a rule, the special superstructures are subsequently retrofitted to the already roadworthy chassis by bodybuilders specializing in such retrofits. An important criterion in the retrofitting or conversion of the chassis is the adaptation of the entire vehicle to the road traffic regulations. These rules may vary nationally. In Germany, for example, motor vehicles may fall below a permissible total weight of 7.5 to with a driver's license of the class 3 (old classification) resp. C1 (new classification). Furthermore, in Germany, the Sunday driving ban on public roads applies only to motor vehicles with a gross vehicle weight of more than 7.5 to. On the manufacturer's side, the chassis are equipped with axles specified by the vehicle manufacturers. Although the axles provided by default cover most of the applications, and thus in a simplified way the "mass market", they are not optimally suitable for all applications.

For example, the already mentioned chassis type VW Crafter are standard with a 1.8 to front axle and one 2.25 to rear axle ( 3 to chassis) or 3.5 to rear axle ( 5 to chassis). To one 3 to chassis or a 5 To upgrade the chassis to a higher payload, the standard chassis can be equipped with an additional rear axle. This additional axle can be an axle fixed relative to the chassis or a so-called lift axle. A lift axle can be lowered during work and lifted when empty. When the lift axle is lowered, the maximum payload can thus be loaded. When empty, the lift axle can be raised to reduce fuel consumption and to protect the tires.

An additional rear axle can thus be added to a standard chassis if required or on customer request by bodybuilders and increases in the result the permissible total weight.

As already mentioned in Germany is the weight class 7.5 to particularly interesting. In principle it is possible to enter 5 to vehicle by adding an additional 2.25 to axle to a gross vehicle weight of 7.5 to rebuild. However, this vehicle then has two different rear axles, namely one 3.5 to drive axle and an additional 2.25 to axis.

In vehicles with different rear axles, however, the equipment with a ride comfort enhancing additional hydropneumatic suspension or with an additional air suspension is not readily possible: The force acting on the different axes weight load leads to different pressures in the cylinders and the bellows and thus to different wear and / or degraded ride comfort.

If a chassis is equipped with two identical axles, the permissible total weight realized herewith may differ from a desired permissible total weight. In the example VW Crafter can a 3 to chassis with a second 2.25 to rear axle or one 5 to chassis with a second 3.5 equipped to rear axle. In the first case, so a chassis with a 1.8 to front axle and two 2.25 to rear axles, this results in a permissible total weight of 6.3 to. This will be the driver's license C1 permissible weight class of 7.5 to not fully exploited and thus limits the transport capacity.

In the second case, so a chassis with a 1.8 to front axle and two 3.5 to rear axles, this results in a permissible total weight of total 8.8 to. In Germany, however, such a registered vehicle should not with the already mentioned driving license of the class C1 (old driving license class 3 ) be driven. Will that work? 8.8 to total weight designed vehicle only for the weight class 7.5 To be approved, it is oversized in terms of its axle equipment and therefore correspondingly expensive.

Out DE 10 2017 107 680 A1 is a motor vehicle with a special structure in the form of a tiltable loading platform known. The motor vehicle has two rear axles, of which the second rear axle seen in the direction of travel is designed as a lifting axle and can be raised relative to the chassis. The rear axles are mounted on leaf springs in a known manner. An additional air suspension or hydropneumatic suspension to increase ride comfort is not provided. This vehicle can have two different rear axles a gross vehicle weight of 7.5 to have. However, the ride comfort is limited because the two rear axles only leaf springs and no additional hydropneumatic suspension or air suspension,

The object of the invention is therefore to propose a transport vehicle with high ride comfort and optimized payloads and to eliminate the disadvantages mentioned.

This object is achieved by a motor vehicle having the features of claim 1.

The motor vehicle comprises a chassis, a front axle, a first rear axle, which is supported by first axle carriers, and a second rear axle, which is supported by second axle carriers. The axle carrier of the first rear axle and / or the axle carrier of the second rear axle may be designed as leaf springs. Both the axle carrier of the first rear axle and the axle carrier of the second rear axle each have three bearings: A respective first bearing couples the axle carriers to the chassis, a respective second bearing couples the respective axle to the respective axle carrier. A respective third bearing couples the axle carriers to additional spring elements which in turn are directly or indirectly connected to the chassis.

• - die Traglast der ersten Hinterachse sich von der Traglast der zweiten Hinterachse unterscheidet,
• - die Lagerungen der ersten Hinterachse und die Lagerungen der zweiten Hinterachse so auf den Achsträgern angeordnet sind, dass trotz unterschiedlicher Traglasten der beiden Hinterachsen die hieraus resultierenden Belastungen einander entsprechende Belastungen in den Federelementen bewirken.

It is essential that:

• the load capacity of the first rear axle differs from the load capacity of the second rear axle,
• - The bearings of the first rear axle and the bearings of the second rear axle are arranged on the axle beams that cause despite different loads of the two rear axles, the resulting loads corresponding loads in the spring elements.

This makes it possible to supplement the factory provided standard first rear axle with an additional second rear axle so that on the one hand, a desired permissible total weight, for example 7.5 to, is realized and on the other hand when attaching an additional suspension equally large forces are introduced into the spring elements of the additional suspension.

These advantages are independent of the type of additional suspension. Particularly suitable as an additional suspension, however, is an additional pneumatic suspension or an additional hydropneumatic suspension. Because equal forces are introduced into the spring elements, identical or exchangeable spring elements can be used.

Since the erfindungsmäß storage of the two rear axles and the resulting equal forces in the spring elements of the additional suspension same components, such as the same hydraulic cylinder or same air bellows, can be used, the repair and maintenance friendliness increases.

Preferably, the load of the first rear axle is greater than the load of the second rear axle. The vehicle manufacturer side provided first rear axle usually forms the drive axle and has a relatively large load capacity. In the already mentioned example of a VW Crafters with 5 To suspension, the rear axle has a load of 3.5 to. To a predefined permissible total weight of 7.5 To realize, is thus the addition of the 5 to suspension with a lighter 2.25 to additional rear axle possible. In the example mentioned, the second rear axle can be made lighter due to its lower load relative to the first rear axle. This is an advantage as with a 2.25 To axle no twin tires is required, but rather the axle can be equipped with a single tire and thus two tires can be saved.

By equipping the vehicle with a lift axle, fuel consumption and tire wear are reduced relative to a motor vehicle in which the auxiliary axle is not raised as needed can be. For the raising and lowering of the lift axle, a manual control or an automatic, preferably load-dependent, control can be provided.

• - die durch die erste Traglast in der dritten Lagerung der ersten Hinterachse bewirkte Kraft sowie
• - die durch die zweite Traglast in der dritten Lagerung der zweiten Hinterachse bewirkt Kraft

gleich und entsprechen einer Gewichtskraft in einem Bereich von 1,2 to bis 1,8 to entsprechen. Hintergrund ist, dass sowohl bei der ersten als auch bei der zweiten Hinterachse die jeweilige Gesamttraglast der Achse in jeweils zwei Lagerungen aufgenommen wird. Bei dem Ausführungsbeispiel VW-Crafter mit einer Traglast von 3,5 to an der ersten Hinterachse wird diese Traglast somit zu einem Teil in der ersten Lagerung und zum restlichen Teil in der dritten Lagerung aufgenommen. Entsprechend ist es auch bei der Traglast der zweiten Hinterachse. Diese zweite Hinterachse weist vorzugsweise eine Traglast von 2,25 to auf. Wenn sowohl bei der 3,5 to Achse als auch bei der 2,25 to Achse eine gleich große Kraft in die jeweils dritte Lagerung eingeleitet werden soll, ist es besonders günstig, wenn dieser gleich große Anteil sich in einem Bereich von 1,2 to bis 1,8to bewegt. Hierdurch wird die Gewichtsverteilung auf alle Lagerstellen optimiert und der Fahrkomfort verbessert.In a preferred embodiment:

• - The force caused by the first load in the third bearing of the first rear axle and
• - The force caused by the second load in the third bearing of the second rear axle

equal and correspond to a weight force in a range of 1.2 to to 1.8 to match. The background is that both the first and the second rear axle, the respective total load of the axle is taken in two bearings. In the embodiment VW Crafter with a load of 3.5 to the first rear axle, this load is thus taken up in part in the first storage and the remaining part in the third storage. Accordingly, it is also in the load of the second rear axle. This second rear axle preferably has a load of 2.25 to. If both at the 3.5 to axle as well as at the 2.25 It is particularly advantageous if an equal amount of force is to be introduced into the respective third bearing, if this equally large portion is in a range of 1.2 to move to 1.8to. This optimizes the weight distribution to all bearings and improves ride comfort.

The measures provided for increasing the ride comfort spring elements, which are preferably attached to the respective third bearing point of the two rear axles, may be components of a hydropneumatic suspension, air suspension or other suspension.

If a hydropneumatic suspension is provided, the spring elements are hydraulic cylinders which are coupled in known manner to a pressure accumulator. A vertical movement of the axis in this case causes a movement of the piston in the cylinder, which in turn hydraulic oil is pumped into the pressure accumulator. The pressure accumulator has two chambers which are separated by a membrane. One chamber is integrated in the hydraulic circuit, the other chamber contains a compressible medium, for example nitrogen. The pumped into the pressure accumulator and oppressive against the membrane oil thus causes a compression of the nitrogen and thereby dampens the vertical movement of the axis.

In an air suspension is provided as a spring element usually a bellows, is included in the air. The bellows is airtight connected with other fittings such as cover and rolling piston. The bellows is slipped over a piston and rolls off under pressure on this. The air spring is supplied with compressed air by a compressor. Depending on the load, air is pumped in or out in order to keep the filling volume and thus the level position of the vehicle constant.

In a preferred embodiment, the third bearing of the first rear axle and the first bearing of the second rear axle are arranged side by side in the direction of travel, so that both bearings have an equal distance from the first rear axle and an equal distance from the second rear axle.

For example, the third bearing of the first rear axle may be provided for receiving a spring element, such as a hydraulic cylinder or an air bellows. In the first storage of the second rear axle may be a spring shoe, in which the axle of the second rear axle is received. In the said preferred embodiment, therefore, the spring shoe of the second rear axle and the spring element of the first rear axle are arranged side by side in the direction of travel and thus have the same distance to the bearings of the rear axles or their center lines.

For the third storage of the first rear axle and the first storage of the second rear axle, a common bearing block may be provided. As a result, a modular standardization and thus a simple and inexpensive installation can be achieved.

In order to facilitate assembly and to realize the spring function, can be provided for receiving the spring elements to the spring elements adapted recordings. Vorzugseise these shots are on said common bracket, which is provided for mounting the third bearing of the first rear axle and the first support of the second rear axle. If the spring element is an air bellows, the special receptacle may be designed in the form of a collar enclosing the air bladder. If the spring element is a hydraulic cylinder, the receptacle may be a breakthrough in the common axle block. The breakthrough creates a space for the realization of an adapted to the cylinder length spring travel.

Preferably, the distance between the second bearing and the third bearing of the first rear axle is 450 mm to 600 mm, most preferably 500 mm to 550 mm.

As already explained above, it is an object of the invention to combine the bearings of two different rear axles so that both axles each have a bearing in which an equally large force or load can be absorbed.

As also already explained, offers in motor vehicles with a first rear axle load of 3.5 to the combination with one 2.25 to axis, because thereby the desired gross vehicle weight of 7.5 to be realized. The aim now is to arrange the bearings so that when using the different axes, here the 3.5 to axis and the 2.25 To axle act in each case a bearing of these two axes under load the same size forces. If this goal is realized, it is possible to use the same additional spring elements on both axes, for example the same hydraulic cylinder or equal to air bellows.

The distance from axle to first bearing can be pre-defined by the manufacturer on 400 mm. Furthermore, it can be predefined that in the first rear axle with a load of 3.5 to a share of 2 to in the first storage and a share of 1.5 to be introduced into the second storage. Similarly, for the second rear axle with a payload of 2.25 to be predefined that 0.75 to in the first storage and 1.5 to be introduced into the second storage. In this constellation, therefore, both of the first rear axle and the second rear axle, an equal proportion of each 1.5 to introduced into a storage and thus in a spring element introduced in this storage.

Experiments have shown that in such a constellation, the distance from the first axis to the first spring element about 500 mm to 550 mm and from the second axis to the second spring element must be 200 mm. In such a constellation, the following values result: Distance first storage to second storage (axis) Distance second bearing (axle) to third bearing (spring) Distance first storage to third storage (spring) Payload / force in the first storage Payload / force in the third storage First rear axle (3,5 to) 400 mm 515 mm 915 mm 2.0 to 1.5 to Second rear axle (2.25 to) 400 mm 200 mm 600 mm 0.75 to 1.5 to

Of course, other constellations are possible in which from both rear axles, an equal proportion of each is introduced into a storage and in which thus the same spring elements can be used.

Further measures improving the invention will be described in more detail below with the description of preferred embodiments of the invention with reference to the figures.

• 1 zeigt ein Kraftfahrzeug-Fahrgestell in einer perspektivischen Ansicht;
• 2 zeigt zwei zur Anbringung an ein Fahrgestell vorgesehenen Achsen mit gleicher Traglast in einer perspektivischen Ansicht;
• 3 zeigt die beiden Achsen gemäß 2 in einer schematischen Darstellung;
• 4 zeigt das Funktionsprinzip einer hydropneumatischen Federung zweier Achsen in einer schematischen Darstellung;
• 5 zeigt ein Ausführungsbeispiel einer erfindungsgemäßen Achskombination mit hydropneumatischer Federung in einer perspektivischen Ansicht;
• 6 zeigt das Ausführungsbeispiel gemäß 5 in einer schematischen Ansicht;
• 7 zeigt eine Achskombination gemäß dem in 5 und 6 dargestellten Beispiel angebaut an ein Kraftfahrzeug-Chassis in einer perspektivischen Ansicht;
• 8 zeigt die Achskombination aus 7 ohne Chassis in einer perspektivischen Ansicht von unten;
• 9 zeigt ein den 5 bis 8 ähnliches Ausführungsbeispiel mit Luftfederung;
• 10 zeigt die Achskombination aus 9 ohne Chassis in einer perspektivischen Ansicht von unten.

The figures show:

• 1 shows a motor vehicle chassis in a perspective view;
• 2 shows two provided for attachment to a chassis axes with the same load in a perspective view;
• 3 shows the two axes according to 2 in a schematic representation;
• 4 shows the functional principle of a hydropneumatic suspension of two axes in a schematic representation;
• 5 shows an embodiment of an axle combination according to the invention with hydropneumatic suspension in a perspective view;
• 6 shows the embodiment according to 5 in a schematic view;
• 7 shows an axle combination according to the in 5 and 6 illustrated example mounted on a motor vehicle chassis in a perspective view;
• 8th shows the axle combination 7 without chassis in a perspective view from below;
• 9 shows the one 5 to 8th similar embodiment with air suspension;
• 10 shows the axle combination 9 without chassis in a perspective view from below.

The same or similar elements may be provided in the following figures with the same or similar reference numerals. Furthermore, the figures of the drawing, the description and the claims contain numerous features in combination. It is clear to a person skilled in the art that these features are also considered individually or that they can be combined to form further combinations not described here in detail. The invention expressly extends to such embodiments, which are not given by combinations of features of explicit back references of the claims, whereby the disclosed features of the invention, as far as is technically feasible, can be combined with each other arbitrarily. The exemplary embodiments illustrated in the figures therefore have only descriptive character and are not intended to limit the invention in any way.

The terms used hereafter: "upper", "upper", "lower", "left" or "right" refer to those in 1 illustrated arrangement of a standing on a solid surface motor vehicle seen in the direction of travel.

1 shows a motor vehicle 100 with a chassis 10 , a front axle 11 and two rear axles 20 and 30 , The in the direction of travel FR seen front rear axle is subsequently called the first rear axle 20 and seen in the direction of travel rear rear axle as a second rear axle 30 designated. In the illustrated embodiment, the front axle 11 a load of 1.8 to, the first rear axle has a payload of 3.5 to and the second rear axle has a payload of 2.25 to. This results in a total load of 7.55 to. Such vehicles are commonly referred to in Germany as 7.5 to motor vehicles approved for public transport.

The 2 and 3 show two provided for attachment to a chassis (not shown) rear axles 20 and 30 with the same load T1 and T2 of each 2.25 to. Because the two payloads T1 and T2 are the same size is not an embodiment of the invention but an example, as it is known from the prior art.

The first rear axle 20 is designed as a drive pocket and is made of two axle beams 21 carried. The second rear axle 30 is as a lift axle 29 executed and is supported by two axle beams 31 carried. In this and the following embodiments are the axle carrier 21 and 31 always in the form of leaf springs. Alternative to axle beams 21 . 31 In principle, other and / or unsprung axle carriers can also be used in the form of leaf springs.

The front end 22 . 32 this leaf spring axle carrier 21 . 31 is each in a spring shoe 15 and thus forms a first depository 21.1 . 31.1 of the respective axle carrier 21 . 31 , Here are the spring shoes 15 on storage blocks 16 (first rear axle 20 ) and 17 (second rear axle 30 ) appropriate. The bearing blocks 16 and 17 are in turn with the chassis 10 (in 2 and 3 not shown). The back end 23 . 33 the leaf spring axle carrier 21 . 31 is an additional spring element 24 . 34 coupled, in turn, with the chassis 10 connected is. The inclusion of the spring elements 24 . 34 forms at the axle beams 21 . 31 in each case a third depository 21.3 . 31.3 out.

Between the first depository 21.1 . 31.1 and the third depository 21.3 . 31.3 have the axle carriers 21 . 31 each second storage locations 21.2 . 31.2 on, to which the first rear axle 20 or the second rear axle 30 is coupled.

At the spring elements 24 . 34 is it in the in the 2 to 7 Example shown to cylinder 40 a hydropneumatic suspension 13 , Instead of a hydropneumatic suspension 13 can also have air suspension 14 (see. 8th ) or another suspension may be provided.

When a force acts on the rear axle 20 . 30 move the pistons of the cylinders 40 load-dependent within the cylinder 40 on or off and cushion the suspension. (See the following remarks to 4 ).

In the in the 2 and 3 example shown have both rear axles 20 . 30 a load of each 2.25 to. Between the first storage 21.1 . 31.1 and the second storage 21.2 . 31.2 is a distance 25 . 35 of 400 mm each. Between the second storage 21.2 . 31.2 and the third storage 21.3 . 31.3 is a distance 26 . 36 of 200 mm each. This results in a total distance 27 . 37 between first storage 21.1 . 31.1 and third storage 21.3 . 31.3 of 600 mm each.

4 illustrates the functional principle of a hydropneumatic suspension 13 , The first rear axle 20 includes first spring elements 24 in the form of hydraulic cylinders 40 , Analogously, the second rear axle comprises 30 second spring elements 34 in the form of hydraulic cylinders 40 , Because the payloads T1 and T2 as well as the installation conditions, ie the distances between the bearing points on the axle beams 21 . 31 are the same, are the cylinders 40 equal executed or identical. line systems 18 and 19 connect the piston chambers and cylinder chambers of the four cylinders 40 in a known manner with two pressure accumulators 12 , In a likewise known manner, the cylinder annular surfaces of the cylinder 40 the second rear axle 30 via a pipe system 42 connected with each other. To the second rear axle 30 To perform as a lift axle and thus raise or lower it can be a corresponding control valve, for example, a 4/2 way valve, can be provided.

The 2 to 4 thus show a hydropneumatic suspension 13 for two identical rear axles 20 and 30 with equal payloads T1 and T2 , However, the functionality of the system is impaired when an axis 20 . 30 is exchanged for another axle with a different load. The different payloads then result in different forces in the cylinders 40 that by similar cylinders 40 can not or only insufficiently processed.

This disadvantage can be eliminated if not only one axis, but also the associated cylinder 40 replaced or replaced by special cylinders. However, this results in the disadvantage for the customer that different cylinders are used on his vehicle. In addition, if it is special cylinder attached by the bodybuilder, they are usually not available in stock at a specialist workshop of the chassis manufacturer, resulting in extended downtime.

According to the invention, this disadvantage is eliminated by using two rear axles 20 . 30 with different payloads T1 and T2 not different cylinders 40 but differently spaced bearings are provided. The cylinders 40 be in to the load of the respective axis 20 . 30 adapted distances to the axle beams 21 . 31 coupled.

In the 5 to 8th an example of an arrangement according to the invention is shown. This concerns the 5 to 7 an embodiment with hydropneumatic suspension 13 and the 8th an example with air suspension 14 ,

In the perspective view in 5 it can be seen that the first spring elements 24 which are hydraulic cylinders 40 as well as at the front end 32 the axle carrier 31 attached spring shoes 15 next to each other on a bearing block 17 are attached. The axle carriers 21 and 31 have, as already described above, each three bearings 21.1 . 21.2 21.3 respectively 31.1 ,, 31.2 . 31.3 on. The first front first storage 21.1 . 31.1 is each by a spring shoe 15 trained, the second storage 21.2 . 31.2 carries the axle 20 or the axis 30 and the third storage 21.3 . 31.3 is to the spring element 24 or. 34 coupled.

This results in distances 25 . 26 and 27 respectively 35 . 36 and 37 between the bearings, the in 6 are shown. While in the illustrated embodiment, the distances 25 and 35 are equal and 400 mm, the distances are different 26 and 36 from each other: the distance 26 from the first rear axle 20 (second storage 21.2 ) to the first spring element 24 (third storage 21.3 ) is 515 mm. The distance 36 from the second rear axle 30 to the third to the second spring element is 200 mm.

When using a first rear axle 20 with a load capacity T1 from 3.5 to and a second rear axle 30 with a load capacity T2 from 2.25 to arise in the spring elements 24 and 34 same forces. In the example shown, the corresponds in the spring elements 24 and 34 acting force of a weight of each 1.5 to. Because the forces in the spring elements 24 and 34 are equal, or interchangeable, spring elements 24 . 34 , here: same hydraulic cylinder 40 be used.

The load T1 the first rear axle 20 from 3.5 to is thus divided into 2 to who in the first storage 21.1 attack and 1.5 to who in the third storage 21.3 attack. Similarly, the load T2 from 2.25 to the second rear axle 30 divided into a partial force of 0.75 to who in the first storage 31.1 attacks and a partial force of 1.5 to who in the third storage 31.3 attacks.

The 7 and 8th show the axle combination according to the in the 5 and 6 illustrated example in a perspective view obliquely from below. The first rear axle 20 and the second rear axle 30 are attached to a motor vehicle chassis 10 , The two rear axles 20 . 30 are each made of two leaf spring-type axle beams 21 . 31 worn Every axle carrier 21 . 31 is at its front end 22 . 32 in a axle shoe 15 stored. The axle shoe 15 forms a first storage 21.1 . 31.1 , At their respective rear end 23 . 33 are the axle carriers 21 . 31 each to a cylinder 40 coupled. The cylinders 40 are part of a hydropneumatic suspension 13 , The crosspoints of the cylinders 40 on the axle beams 21 . 31 form each third depository 21.3 . 31.3 ,

The third depository 21.3 seen in the direction of travel front axle pair 21 as well as the first depository 31.1 the rear axle pair 31 are next to each other on the bearing block 17 arranged. To be able to deflect sufficiently, the bearing block 17 breakthroughs 39 for the cylinders 40 on. The breakthroughs 39 are in one to the assembly of the bearing block 17 belonging bearing plate 43 brought in. At the in 7 hidden side of the bearing block 17 become the cylinders 40 in a receptacle of the bearing block 17 held (cf. 5 ).

The first rear axle 20 is at storage 21.2 to the axle carrier 21 coupled, the second rear axle 30 at the storage 31.2 , Between the first rear axle 20 and the first spring element 24 , so between second storage 21.2 and third storage 21.3 , the distance results 26 , which in the example shown is 515 mm. In 7 is clear that this distance 26 is much larger than the distance 36 between the second rear axle 30 and the second spring element 34 which is 200 mm here. The chosen arrangement causes of the load T1 = 3.5 to the first rear axle 20 a share of 1.5 to in the first, by two hydraulic cylinders 40 formed, spring element 24 is initiated. Analogously, the load T2 = 2.25 to the second rear axle 30 a share of likewise 1.5 to in that too by two hydraulic cylinders 40 formed second spring element 34 initiated. Thus, all four cylinders 40 be executed identical.

The 9 and 10 show the one 5 to 8th similar embodiment. Analogous to the 7 and 8th is a motor vehicle chassis 10 with a combination of two rear axles 20 . 30 shown. In this embodiment, the hydropneumatic suspension 13 by an air suspension 14 replaced. The air suspension 14 has four bellows 41 on. The two bellows 41 the front axle carrier 21 form the first spring element 24 and are on the bearing block 17 appropriate. The two bellows 41 the rear axle carrier 31 form the second spring element 34 and are at an additional bearing block 44 appropriate. To the bellows 41 can support on the bearing blocks 17 . 44 a special receptacle, such as a collar 38 be provided. Also at the in 9 and 10 illustrated example take the two bellows 41 of the first spring element 24 as well as the two bellows 41 of the second spring element 34 each a load of 1.5 to. Analogous to the hydraulic cylinders 40 in 8th are therefore the air bellows 41 identical.

LIST OF REFERENCE NUMBERS

10

chassis

11

Front

12

accumulator

13

hydropneumatic suspension

14

air suspension

15

spring shoe

16

bearing block

17

bearing block

18

line system

19

line system

20

first rear axle

21

axle

21.1

first storage (from ( 21 )

21.2

second storage (from 21 )

21.3

third storage (from 21 )

22

front end (from 21 )

23

rear end (from 21 )

24

first spring element

25

Distance from 21.1 to 21.2 )

26

Distance from 21.2 to 21.3 )

27

Total distance (from 21.1 to 21.3 )

28

Recording (for 24 )

29

lifting axle

30

second rear axle

31

axle

31.1

first storage (from ( 31 )

31.2

second storage (from 31 )

31.3

third storage (from 31 )

32

front end (from 31 )

33

rear end (from 31 )

34

second spring element

35

Distance from 31.1 to 31.2 )

36

Distance from 31.2 to 31.3 )

37

Total distance (from 31.1 to 31.3 )

38

collar

39

breakthrough

40

cylinder

41

bellows

42

line system

43

bearing plate

44

bearing block

100

motor vehicle

T1

Load capacity (from 20 )

T2

Load capacity (from 30 )

FR

direction of travel

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102017107680 A1 [0010]

Claims (9)

A motor vehicle (100) comprising a chassis (10), a front axle (11), a first rear axle (20) carried by first axle beams (21) and a second rear axle (30) supported by second axle beams (31) in which: - the first axle carrier (21) has a first bearing (12.1) for coupling the first axle carrier (21) to the chassis (10), a second bearing (12.2) for coupling the first axle carrier (21) to the first rear axle (12) 20) and a third bearing (12.3) for coupling the first axle carrier (21) to a spring element (24), - the second axle carrier (31) a first bearing (31.1) for coupling the second axle carrier (31) to the chassis ( 10), a second bearing (31.2) for coupling the second axle carrier (31) to the second rear axle (30) and a third bearing (31.3) for coupling the second axle carrier (31) to a spring element (34), - the first one Rear axle (20) for a load (T1) and the second rear axle (30) for a Tragla st (T2), characterized in that - the load (T1) of the first rear axle (20) is different from the load (T2) of the second rear axle (30), - the bearings (21.1, 21.2, 21.3) of the first rear axle (20) and the bearings (31.1, 31.2, 31.3) of the second rear axle (30) are arranged on the axle carriers (21, 31) in such a way that loads resulting from the loadings (T1, T2) in the spring elements (24 , 34). Motor vehicle (100) according to Claim 1 , characterized in that the load (T1) of the first rear axle (20) is greater than the load (T2) of the second rear axle (30). Motor vehicle (100) according to one of Claims 1 or 2 , characterized in that the second rear axle (30) designed as a lifting axle and relative to the chassis (10) can be raised. Motor vehicle (100) according to one of Claims 1 or 3 , characterized in that: - the force caused by the first load (T1) in the third bearing (21.3) of the first rear axle (20) and by the second load (T2) in the third bearing (31.3) of the second rear axle (30) causes strength to equal and correspond to a weight in a range of 1.2-to-1.8-to. Motor vehicle (100) according to one of Claims 1 to 4 , characterized in that the first spring elements (24) and the second spring elements (34) are components of a hydropneumatic suspension (13) or an air suspension (14). Motor vehicle (100) according to one of Claims 1 to 5 , characterized in that the third bearing (21.3) of the first rear axle (20) and the first bearing (31.1) of the second rear axle (30) seen in the direction of travel are arranged side by side, so that both bearings (21.3) and (31.1) have the same Distance (26) to the first rear axle (20). Motor vehicle (100) according to one of Claims 1 to 6 , characterized in that for the third bearing (21.3) of the first rear axle (20) and the first bearing (31.1) of the second rear axle (30), a common bearing block (17) is provided. Motor vehicle (100) according to Claim 1 to 7 , characterized in that for receiving the spring elements (24) to the spring elements (24) adapted receptacles (28) are provided. Motor vehicle (100) according to one of Claims 1 to 7 , characterized in that between the second bearing (21.2) and the third bearing (21.3) of the first rear axle (20) a distance in a range between 450 mm and 550 mm, preferably in a range between 500 mm and 530 mm, is provided.

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