EP1706250B1 - Transit mixer for free-flowing media, in particular concrete - Google Patents

Abstract

The invention relates to a transit mixer for free-flowing media, in particular concrete, the mixing drum of said mixer being mounted on supports. According to the invention, the rollers that bear the circular path of the mixing drum are partially sunk in the support housing.

Description

The invention relates to a truck mixer according to the preamble of claim 1.

Such truck mixers ( DE 44 31 501 ) have to support the mixing drum on the vehicle frame on a front and rear support bracket, the front support bracket carries the drive for the mixing drum and the rear support frame is provided with two rotatably mounted rollers on which the mixing drum is supported with its revolving ring gear. The storage of the rollers takes place here by corresponding roller blocks with two opposite bearing plates in which the rollers are mounted. The roller blocks are bolted by flange-side webs to the top of the support bracket. This design has the disadvantage that the bearing roller bearings easily pollute and also a comparatively large gap between the tread and support frame top is present, thereby increasing the risk of accidents, since people working on truck mixer can very easily reach into the danger area given by the rotating rollers hazard hands , For this reason, relatively large fairing hoods are required to cover the gap to the outside. However, the assembly of the support roller blocks designed very expensive, because on the one hand must be taken care of for an exact alignment of the support roller blocks on the support frame and a corresponding orientation of the rollers mounted in the support rollers, resulting in significant adjustments. It should be noted that for proper storage, the two roles must be properly aligned with respect to the tread of the inclined arranged on the vehicle frame mixing drum.

From the US 4,461,577 a truck mixer with the features of the preamble of claim 1 is known. Likewise, the show US 3,073,580 and the DE 4002491 A1 appropriate truck mixer. In addition, from the US 4,575,254 improved storage options for the mixing drum known by truck mixers.

The object of the invention is to propose a truck mixer that is safer to use, less dirt-prone and easier to clean. According to a further aspect, essentially no adjustment work is required for the carrying roller blocks, in particular also in the case of a roller change.

This object is achieved by the features of characterizing the part of claim 1.

As a result, the gap between the running ring or mixing drum and the support block surface can be substantially minimized so that access to this area from the outside is virtually impossible.

As a result, the rollers are chambered and protected within the support bracket. Next there is the advantage that the rollers mounted on bolts in the Stützbockwänden can be made in one clamping with the support frame, thereby facilitating the adjustment for the proper alignment of the roller surface to the tread of the obliquely arranged on the vehicle frame mixing drum or reduce.

According to the invention, the entire support frame is constructed like a box, resulting in a compact and rigid construction of the support bracket. Here, the trestle hardly offers points of attack or collection points for contamination by accumulation of concrete and the like. And can be easily cleaned otherwise. In particular, however, the roles including the bearings are protected as a result of the chambering within the support block from contamination, which increases the life of the bearings and the rollers. Due to the minimized gap between the tread and trestle surface and the dimensions of the cover plates for the gap reduce.

As a result of the box-like structure of the support block with inner ribs and webs for stiffening and thus as a hollow construction results in a comparatively lightweight, but nevertheless stiffer structure of the support block, which is fastened on laterally attached suitable bearing elements on the vehicle frame.

In a particularly preferred development of the invention, for which separate protection is desired, the support frame housing is designed with two legs. This is expediently carried out by providing the lower region of the support block with a central, essentially tunnel-like recess which extends forwards and downwards, preferably also open to the rear. The bearing elements for the attachment of the support bracket on the frame are in this case formed at the lower end of the support bracket legs. As a result of this structure of the support block, there is some flexibility that allows torsional stresses to be absorbed when driving over bumps within the support block. If, when driving over a pothole, there is a bending of the side member on one side, the flexibility of the two-legged support bracket results in substantially lower loads on the bearing attachments of the support frame than on a support block with high rigidity. Since the recess is provided in the lower region, and preferably approximately in the lower half of the support bracket, above the recess results in a cross-hollow body structure of the support block, whereby a sufficient rigidity of the support block is nevertheless more flexible in the lower storage area guaranteed.

With respect to the roller bearing, it is desirable that the openings in the box cover for the roll penetration in the axial direction of the rollers substantially the roll width and perpendicular to the Rollenachsrichtung are smaller than the roll diameter. As a result, there is a perfect chambering of the stored within the support frame rollers and reduces the risk of injury to the vehicle operators. It goes without saying that at least the width and the length of the opening is dimensioned so that a perfect penetration of the roller for the purpose of Auflagerung the mixing drum is possible, however, the remaining gap is correspondingly low. Due to the sunk arrangement of the rollers, only a small roller segment protrudes upwards beyond the support bracket, which is sufficient for the mixing drum support. Conveniently, in this case, the role with less than 1/3 of the roller radius on the opening before.

For the formation of the two-legged support block structure, it is expedient if the recess is substantially U-shaped and largely free of edges, so curved over the circumference, so that the occurrence of voltage spikes is substantially avoided.

As is known, truck mixers are offered with mixing drums of different Voluminas. In order to for-vehicles with different sized mixer each one and the same To be able to use support frame, adjusting devices for the front and rear support frame are provided in the invention. However, mixing drums for different volumes generally have the same drum diameter and use the same front and rear drum sections, but differ in the length of the cylindrical center section of the mixing drum. As a result, mixing drums having larger volumes are made longer than mixing drums having smaller volumes. For the vehicle-mounted storage, this means that a mixing drum is arranged in a longer version with a smaller inclination of the longitudinal axis to the frame than is the case in the case of a shorter mixing drum. Since according to the invention, the rear support frame is provided with a Längeneinstellungs- and a tilting device, it is possible when using a shorter mixing drum to move the support bracket in the direction of the cab forward and in particular to tilt the two front bearing elements up, so that the roller surface for the Auflagerung of the tread of the mixing drum can be tracked so to speak the overhead crane. The front bearing elements may be designed as bearing pins, bearing tubes, square profiles or the like. Of course, the support bracket in the length-adjusted and tilted position can be locked, according to the specification of the different volumes of the mixing drum conditioned lengths of the mixing drum predetermined locking points for the extent longitudinally displaced or tilted rear support bracket are given. Analogously, the front support bracket is provided with a tilting device, so that a tracking in adaptation to differently long mixing drums is also possible here.

It is of particular advantage that the rollers are each supported by a bolt, wherein between bolts and roller body at least one roller bearing with an inner and an outer ring and with rolling bodies located therebetween, is provided, wherein the inner ring of the rolling bearing in the installed state directly Coaxially disposed around the bolt around. So far, it has been customary to provide between the inner ring and bolt a sleeve on which the inner ring was attached. It has surprisingly been found that this sleeve can be dispensed without disadvantage. As a result, a further saving of material is achieved. In the construction according to the invention, the outer ring of the rolling bearing is pressed into the roller body. The trained as tapered rollers rolling elements are in a cage between outer and inner ring. Between bolt and inner ring of the bearing a clearance fit is provided so that the bolt can be removed without much effort.

In a further development of the invention is advantageously provided that the rollers carrying bolts on the one hand in an opening in a front support bracket wall forming the first sheet and on the other in a further, opposite opening, in a rear-side support bracket wall forming sheet, releasably are held. The sheets used may for example consist of steel, aluminum carbon fiber materials or plastics. In this embodiment of a truck mixer according to the invention can be dispensed with the known support roller blocks. As a result, further material can be saved. The roller bearings, which are arranged coaxially around the bolts, are also arranged within the support bracket in this embodiment. This reduces the risk of accidents on the one hand and on the other hand is avoided with advantage that dirt can penetrate into the bearings. The ingress of dirt into the support frame can be significantly reduced by the fact that lateral scraper elements are provided, which significantly reduce the gap between the rollers and the upper support block surface. Furthermore, the inventive holder of the bolt is characterized by a high strength. It is advantageously provided that the openings in the interior of the support bracket in coaxial with the bearing bushes continue or that the openings are formed by the bearing sleeves. As a result, among other things, an improved bolt insertion is ensured. The construction according to the invention substantially increases the manufacturing accuracy. The fact that the openings can be introduced into the trestle after its completion, the position of the bolt and thus the position of the bearing to the race and the rollers is exactly defined. So far, it was necessary to position the idlers on the trestle exactly to ensure an exact angular position. For this purpose, an increased workforce has been required so far. Corresponding advantages also arise when changing the rollers.

It is also conceivable that the bolt is not guided on at least one side through an opening in the sheet, but is held only in a bearing sleeve in the interior of the support block.

It is of particular advantage that the bolt is a stepped bolt, and that the bolt has at its thinner end an external thread, in which a groove nut is arranged engaging. At its thicker end, the bolt on a bolt head with ring bearing surface, with which he rests on the back of the support bracket. Advantageously, this is a recess provided with contact surface in the bearing sleeve or directly in the rear side plate. The bolt is advantageously performed by the opening in the rear-side plate with its thinner end ahead through a central opening in the reel body to the opposite opening in the front panel. The opening in the rear-side plate is larger than the opening in the fronseitigen sheet to accommodate the thicker end of the stepped bolt can. On the thinner bolt end provided external thread now a nut is screwed from the outside. With the help of this groove nut the bolt is clamped in the support frame. At the same time the bolt is pulled laterally with its stepped stop surface from the rear side against the rolling bearing, whereby the rolling bearing is biased with advantage. The preload can be adjusted by turning the nut. In the rear opening of the bolt, for example, secured by a metal pin, against rotation. Of course, you can also choose the opening sizes, etc. so that the bolt from the front side into the trestle insertable and fastened in this reverse position.

In order to ensure the simplest possible replacement of the rollers or the bearings after their wear, openings are provided in the support frame, preferably lateral, for replacing the rollers and the roller bearings. Of course, it is also conceivable to provide the openings below the rollers in the form of a roller shaft. To change the rollers, the rollers must be relieved by supporting the mixing drum. Thereafter, the bolts are released by removing the locknuts and can be removed from the rear. The reel body are removed together with the rolling bearing through the side openings and replaced by new roller body.

In order to protect the roller bearings from unnecessary contamination, it is advantageously provided that the openings are designed to be closable. This is done in the simplest way by laterally aufzuschraubende on the support block plates made of metal or plastic.

To increase the bearing life, a grease nipple is provided for lubrication of the bearings with advantage in each bolt rear or front.

It is particularly expedient that the support bracket on both sides upwards in each case a support arm, in particular for holding the hopper and the outlet shell, continues, wherein the upper edge profile of the rear-side support block surface forming sheet and / or the front-side support block surface forming sheet at least in one Partial U-shaped curved or V-shaped contoured. If in the description and the claims of sheet metal is mentioned, of course, be covered with sheets, which are composed of several sheets. The measure that the support bracket continues on both sides upwards in each support arm, has strength and aesthetic benefits. By U- or V-shaped contouring of the sheet edges, the support frame construction is stiffened. The brackets go over into the trestle. Due to the special design of the sheets, which corresponds to the force curve, can be dispensed with additional struts between the support arms, which were previously necessary to ensure the rigidity of the support arms. Especially occurring in cornering, acting on the support arms forces are absorbed by the inventive design of the support block.

Furthermore, it is advantageous that the plates forming the opposite inner surfaces of the support arms in the longitudinal center plane of the vehicle in a substantially U-shaped or V-shaped unite and form an upper support block surface, are provided in the openings for the rollers. The upper support block surface prevents the ingress of dirt into the trestle. Due to the inventive design of the support block surface is achieved that the shape of this upper support block surface is adapted to the U- or V-shaped configuration of the support bracket side surfaces. The openings within the upper support block surface are necessary so that the tread of the mixing drum can be supported by the two rollers of the support block. Advantageously, the openings are just so large that the rollers can be easily rotated. The smaller the opening, the less dirt can get into the interior of the hollow body.

To further increase the stability of the Stützbocktragarmkonstruktion, it is advantageously provided that the rear-side support block surface forming sheet and the front-side support block surface forming sheet each with its upper edge with the edges of the U and. V-shaped support block surface forming sheet, preferably over the entire edge length, connected, in particular welded.

Fig. 1

eine Seiten ansicht eines Fahrmischers mit einem vorderen und hinte- ren Stützbock,

Fig. 2

eine perspektivische Ansicht einer Ausführungsform eines Stützbocks mit Tragarmen,

Fig. 3

eine perspektivische Ansicht des Stützbocks nach Fig. 2, gesehen un- ter einem anderen Winkel,

Fig. 4

eine Ausführungsform eines Rollenlagers,

Fig. 5

eine perspektivische Ansicht des in den Figuren 2 und 3 dargestellten Stützbocks, jedoch ohne Tragarme und ohne Rollen,

Fig. 6

eine perspektivische Ansicht einer weiteren Ausführungsform eines Stützbocks in Kastenbauweise,

Fig. 7

eine Ansicht des in Fig. 6 dargestellten Stützbocks, gesehen unter ei- nem anderen Winkel und mit daran angeschlossenen Tragarmen,

Fig. 8

eine perspektivische Ansicht des Stützbocks nach Fig. 6 und 7 unter einem anderen Blickwinkel,

Fig. 9

eine perspektivische Ansicht einer weiteren bevorzugten Ausfüh- rungsform eines zweischenklig gestalteten Stützbockaufbaus,

Fig. 10

eine schematische Ansicht einer Mischtrommel in Auflagerung auf einem vorderen und hinteren Stützbock sowie

Fig. 11

eine analo ge Ansicht nach Fig. 10 einer Mischtrommel mit geringe- rem Nennvolumen sowie

Fig. 12

eine weitere alternative Ausfübrungsform eines Stützbocks mit 3- Punkt-Lagerung.

Hereinafter, preferred embodiment of the invention will be described with reference to the drawings. Show in it

Fig. 1

a side view of a truck mixer with a front and rear support bracket,

Fig. 2

a perspective view of an embodiment of a support bracket with support arms,

Fig. 3

a perspective view of the support bracket after Fig. 2 , seen from another angle,

Fig. 4

an embodiment of a roller bearing,

Fig. 5

a perspective view of the in the Figures 2 and 3 shown supporting blocks, but without support arms and without rollers,

Fig. 6

a perspective view of another embodiment of a trestle in box construction,

Fig. 7

a view of the in Fig. 6 shown support brackets, seen at a different angle and with connected support arms,

Fig. 8

a perspective view of the support bracket after Fig. 6 and 7 from a different angle,

Fig. 9

3 is a perspective view of a further preferred embodiment of a two-leg support frame construction,

Fig. 10

a schematic view of a mixing drum in bearing on a front and rear trestle and

Fig. 11

an analo ge view Fig. 10 a mixing drum with a smaller nominal volume as well as

Fig. 12

Another alternative Ausfübrungsform a support bracket with 3-point storage.

Fig. 1 shows a concrete truck 1 in the form of a truck with a frame 2, which is usually formed of two parallel side members and a front and rear support bracket 3 and 4 carry, on which a 5 designated mixing drum for concrete or the like. Dickstoffe is taken and stored. In the area of the front support bracket 3 and the drive for the mixing drum 5 is arranged, which is shown here but only schematically. The mixing drum 5 is rotatably mounted on the support frame via a running ring 6 formed on the rear part of the drum. For this purpose, the support block 4, as shown Fig. 2 it can be seen, two rollers 7, which are rotatably mounted in the support frame 4.

In the embodiment according to Fig. 2 and 3 the upper portion of the support block 4 is formed of a box-shaped housing, which consists essentially of a front support bracket wall 8 and a rear Fig. 3 apparent support bracket wall 9 is formed, which are bridged at the top of a top wall 10. This is arcuate in adaptation to the diameter or the race 6 of the male mixer drum 5 to be recorded. On both sides in the upper region of the support frame two support arms 11 are provided which are formed in the illustrated embodiment equally as a box hollow profile and connected to the box structure of the upper support bracket section. These support arms 11 are suitably connected to the support arch, by welding and / or screw, for which the support bracket is provided in the upper region in the region of its front and rear support frame wall with suitable interfaces or junctions 12. On the side bolsters of the trestle or, as in Fig. 2 represented on the side cheeks 13 of the support arms 11 access cover 14 are provided, which are attached by plugging or by screw and allow access from the outside into the interior of the support frame or to the rollers 7 received therein. The support arms 11 surround laterally on both sides of the mixer drum 5 and take as from Fig. 1 shows, the hopper 15 for the concrete supply and the discharge hopper 16. Furthermore, a pouring chute 17 is provided.

The upper box-like part of the support block 4 is supported by two oblique support struts 18 and rear spars, which are connected to a support frame 19, via which the support bracket is arranged on the side members or the frame 2. D he support frame 19 is composed of two longitudinal beams 20 and two cross members 21. In the illustrated Embodiment, the support struts and the spars are formed by square sections. This results in a comparatively rigid construction of the support block 4.

How best Fig. 2 shows, the rollers 7 are sunk for the Auflagerung the mixing drum received within the support block 4 and look out of openings 22 of the top wall 10 only as far as it is required for storage purposes for supporting the mixing drum.

As in particular from the Fig. 4 and 5 shows, the rollers 7 are mounted on bolts 23, which are designed as a stepped bolt. Each bolt is received in opposed bearing holes 24 and 25 in the front and rear support bracket walls 8 and 9. These openings 24 and 25 continue within the Stützbockkastens as bearing sleeves 26 and 27, as best of Fig. 5 evident.

The rear-side bearing sleeve 27 has at its outer end over its circumference a recess 28 with an annular bearing surface. In this recess 28 of the bolt head 29 of the stepped bolt 23 is received with a lower ring support surface ( Fig. 4 ). At the periphery of the thinner end of each bearing pin 23, an external thread 30 is provided. The bearing pin 23 is clamped by means of a groove nut 31 between the rear support frame wall 4 and the front support bracket wall 3. At its thicker end, the bearing pin 23 is secured against rotation in the usual way.

Between the bearing pin 23 and the roller body 32 designed as a tapered roller bearing roller bearing 33 is provided. The outer ring 33 of the rolling bearing 33 is pressed into the roller body 32. The trained as a truncated rolling elements 35 are arranged in a cage, not shown. The rolling elements 35 are supported on an inner ring 36. In this embodiment, the rolling bearing is designed as a double-row bearing with two inner and two outer rings. Contrary to the known state of the art is between inner ring 36 and bearing pin 23 no sleeve. The inner ring 36 of the rolling bearing 35 is disposed directly coaxially about the bearing pin 23 around. Between bearing pin 23 and inner ring 36 a clearance fit is provided so that the pin 23 can be removed in a simple manner.

How best Fig. 2 As can be seen, the upper end wall 10 of the support block is bowed or curved in alignment with the mixer drum, as well as the upper edges 37 and 38 of the front support bracket and the rear support bracket cheeks 8 and 9. This leaves only a small gap between the mixing drum and support bracket , In addition, the transition between support bracket 4 and support arms 11 is stiffened, which is due in particular by the formation of the support arms and the support bracket in this area as a hollow profile component. On additional struts between the support arms 11 and between the support arms 11 and the support bracket 4 can be dispensed with. As a result, the overall structure of the support frame is streamlined and result in virtually no dirt collection points.

Furthermore, there is a compact encompassing of the mixing drum, in particular due to the out Fig. 2 quite significant recessed arrangement of the rollers 7 within the support frame, so that only more narrow trim plates 39 for closing the remaining smaller gap between the circumference of the mixing drum and the upper end wall 10 of the support bracket are required.

For the sake of completeness, it should be noted that a bearing bracket 40 for the one-armed mounting of the swivel arm (not shown) with the chute or chute 17 is provided on the rear-side support frame cheek 4.

Out Fig. 4 Finally scraper elements 41 can be seen, which reduce the gap between the rollers 7 and the edges of the two openings 22 in the end wall 10. By Abstreiferelemente 41, the contamination of the bearing is significantly reduced. The scraper elements 41 are in this case designed as angle elements and screwed with their base with the upper support block surface. Instead of such scraper elements 41 brushes or rubber scrapers and the like. Can be used.

In the FIGS. 6 to 8 an alternative construction of a rear support bracket 4 is shown, wherein the same reference numerals are used for the same components. Different from the embodiment according to the Figures 2 . 3 and 5 is the support frame construction shown here altogether box-like. The upper portion with the arcuately shaped end wall 10 receiving the two support arms 11 and the upper, front and rear wall portions are similar to the upper portion of the support bracket 4 according to FIGS Figures 2 . 3 and 5 built up. In the upper support bracket section here are also the rollers 7 sunk within the box or box-like constructed support bracket 4, which extend only slightly from the two openings 22 to record the resting on the support frame 4 mixing drum rotatable with a small intermediate gap. In that regard, reference may be made to the previously described embodiment. Again, the support arms 11 are welded via the junction 12 with the upper support bracket section or the like. As in particular from Fig. 6 shows, the bearing sleeves 26 and 27 for receiving the rollers accordingly Fig. 3 taken up in two support cheeks 44 and 45, whose upper edge are formed analogous to the curved course of the top wall 10. Following these two support cheeks 44 and 45, the support bracket 4 continues down through a front support bracket wall 46 and a rear, not apparent in the drawing, but also closed support bracket wall continues. These two support bracket walls are laterally connected by respective side walls 47 to a housing box. By internal ribs or webs of the housing box is stiffened accordingly. At the lower end of the support block 4 are located on each side two projecting achstuhlelartige bearing parts, via which the storage of Stüzbockaufbaus done on the frame. Alternatively, it is also possible to provide the support frame structure with penetrating tubes or bolts for this purpose. These may be axle-stub-like pins, bolts, bearing flanges, bearing webs and the like. According to the invention results in a compact, relatively rigid and outwardly closed trestle structure, are taken up by the particular stored rollers 7 on the raised support brackets protected. Since the support block forms a unit, the bearings for the rollers can be machined mechanically in one unit with the support frame, which simplifies the adjustment work considerably. It should be noted that the bearing pins for the rollers must be aligned exactly to ensure proper rotatory recording of the voluminous mixing drum. Due to the overall smooth outer surfaces, which is particularly important for the concrete mixing vehicles described here, the accumulation of contamination by concrete or mortar largely avoided or facilitates cleaning.

The bolts 48 are clamped or screwed in a conventional manner by U-shaped brackets or Brieden with lateral projections of the side members of the frame. The advantage of the overall stiff construction of the embodiment according to the FIGS. 6 to 8 is that in particular the roll stability of the vehicle is increased.

In a further embodiment of the invention, the box-shaped support block structure according to Fig. 9 again formed more flexible by forming a central recess 50 in the front and rear side wall, whereby the Stützbockaufbau is formed in the lower region, so to speak U-shaped with two Stützbockschenkeln 49, where the achsstummelartigen bolts 48 are attached. Although this is the roll stability compared to the embodiment of the FIGS. 6 to 8 Although somewhat reduced, but corresponding torsional forces can be taken in an excellent manner, for example, arise when a vehicle with a concrete mixing drum driven over potholes or the like, which can lead to a deformation of one of the two side members, which in the area of the support frame construction corresponding Tordierungen occur due to the more flexible design of the support frame construction according to Fig. 9 can be included. As a result, the bearing pin 48 and the attachment of the bolt on the frame are much less stressed. It should be noted that this can cause loads of up to 15t. When bending the side member when driving over bumps, the distortion can be absorbed within the support frame construction. In this case, it is not necessary that the rear, lower support bracket wall is formed with such a recess, but this may well be closed, at least it must be ensured that at least in the front region of the support frame construction a quasi-zweischklige construction of the lower portion of the box-like support frame construction is reached through the recess. This is best seen from the illustration in Fig. 9 , With this embodiment, an overload of the bearing areas of the support block construction on the longitudinal beams is avoided even at high torsional stresses.

It is known that concrete vehicles are delivered with different sized mixing drums, which are usually used here between vehicles with mixing drums with a nominal volume of 6, 7, 8, 9 and 10 m ³ . Here, in general, the drum diameter of the mixing drums is the same, but the cylindrical part of the mixing drum becomes designed with different lengths. This is best shown by comparing the Figures 10 and 11 , Fig. 10 shows a mixing drum 5 with a nominal volume of, for example, 10 m ³ , whereas Fig. 11 shows a mixing drum 5 with a nominal volume of 6 m ³ . The front part 51 and the rear part 52 of the mixing drum are unchanged in both embodiments of the mixing drum 5, but the central cylindrical portion 53 is designed to have different lengths. As a result, substantially the same components of the mixing drum can be used for different nominal volumes. In order to use according to the invention, despite the use of mixing drums with different Voluminas the same support brackets for the front and rear area, the rear support frame 4 is provided with an adjusting device, a longitudinal displacement of the rear support frame in the axial direction of the side members and a pivoting of the rear support bracket allows. The front support bracket 3, however, is provided with an adjusting device which allows pivoting of the front support bracket.

Fig. 10 shows an arrangement of a mixing drum on a concrete vehicle, in which the adjusting device of the rear support frame 4 is in neutral position, ie the support frame 4 is in a non-pivoted position in which the axes of the bearing pin 48 span a plane substantially parallel is to the side rails. For the neutral position, a mean drum size, for example, a drum with a nominal volume of 9 m ³ is expediently used, so that the tilt angles are not too large. In the larger drums, so drums with a longer length, the trestles must then be tilted backwards. For shorter drums, the trestles must then be tilted forward. Here are the side members in the Figures 10 and 11 only schematically indicated by a solid straight line below the bearing pin 48. In the event that now a mixing drum according to Fig. 11 is used, which has a lower nominal volume and thus a shorter cylindrical portion 53, the rear support bracket 4 of the in Fig. 10 shown neutral position on the adjusting device due to longitudinal guide members forward, so moved towards the cab of the concrete vehicle and slightly pivoted upwards with respect to its rear portion, as it by the angle β in Fig. 11 is indicated. As a result, the roller bearing of the support block 4 with respect to the Laufranz 6 tracked and aligned, as in the shorter running mixing drum according to Fig. 11 the mixing drum is more tilted, as in the longer mixing drum after Fig. 10 that is, the axis of the mixing drum includes a greater angle with the plane of the side members 2 than in Fig. 10 , In the embodiment according to Fig. 11 The tilted position of the support block is then locked in a suitable manner, which can be done for example by welding a holder or approximately by the fact that laterally attached to the side rails tabs or transverse plates, which is a guide curve for have a support bracket provided on the guide pin to allow the pivoting movement. The locking is then effected by corresponding locking pins, wherein the pivoting movement of the mixing drum takes place in adaptation to the different Nennvoluminas in predetermined levels. At the same time, how will Fig. 11 it can be seen, the front support bracket 3 is pivoted about its front bearing pin by an angle α upwards, so that in this respect a tracking of the support bracket bearing takes place at the different nominal volumes of the mixer drums.

The embodiment of a support block according to Fig. 12 similar to the construction of the embodiment of the FIGS. 6 to 8 in that the support block construction is box-like. However, this Stützbockaufbau is designed for a 3-point storage on the frame or the side rails. The two rear bearings of the trestle assembly according to Fig. 12 , which are denoted by 48, are according to the embodiment of the FIGS. 6 to 8 formed, wherein the bearings 48 are formed by a continuous through the support frame construction tube. However, different is the storage of the support frame construction in the front area due to the design as a 3-point storage. For this purpose, in the illustrated embodiment, the front portion of the support frame assembly or the front part is formed by a tapered hood 60 with pyramidal or funnel-shaped structure, wherein at the front end a bearing pin 61 is located, which is shown here as stub axle. Ideally, this support point is designed as a ball joint or as an elastic bearing. The support frame structure is displaced with the two lateral bearings 48 relative to the longitudinal members, whereas the support frame structure in the front region can be displaced on a cross member spanning the longitudinal members or the like. How out Fig. 12 can be seen, the bearing 61 is centered with respect to the support block assembly and the two Bearings 48 arranged. Moreover, reference is made to the previous description with respect to the further embodiment of the support frame structure, in particular as regards the upper structure of the support box box including the sunk receiving the support rollers and the lateral support arms of the support frame construction.

The advantage with the embodiment according to Fig. 12 realized 3-point storage is that when torsional stress on the two side members of the vehicle frame is always spanned a plane and thereby forced deformations of the support block structure and corresponding overloading of the bearings are largely avoided. In the case of a 4-point bearing the trestle is held over four bearing points in a plane on the vehicle frame. Upon the occurrence of torsional forces on the two side members resulting from the bending occurring in this case a wandering at least one of the bearing points of the clamped plane, so that forcibly forces acting on the trestle and the bearing points. This must be countered by appropriate design of the storage areas. In the case of the described 3-point bearing such forced deformations are largely avoided on the Stützbockaufbau so that they can not build up correspondingly high forces at the bearings.

Claims (20)

1. A truck mixer (1) for flowable media, in particular concrete, with a mixing drum (5) which has a drum outlet on the rear side and on its external periphery a running ring (6) which is supported in a rotatable manner by at least two rolls (7) of a support bracket (4) mounted on a vehicle frame (2), wherein the rolls (7) of the support bracket (4) are arranged sunk in each case as far as one roll segment in the support bracket (4), and the roll segment projects through an opening (22) in the support bracket (4) in order to support the mixing drum (5), characterized in that the support bracket (4) is formed at least in the upper portion thereof by a box-like housing with a front and rear support wall (8, 9), with preferably side members and with an upper cover wall (10) in which the openings (22) for the through-passage of the rolls (7) are provided.
2. A truck mixer according to claim 1, characterized in that the roll through-passage opening (22) in the axial direction of the roll (7) is substantially the width of the roll, and at a right angle to the axial direction of the roll is smaller than the diameter of the roll (7).
3. A truck mixer according to claim 1 or 2, characterized in that the roll (7) projects beyond the opening (22) by less than 1/3 of the radius of the roll.
4. A truck mixer according to any one of the preceding claims, characterized in that the rolls (7) are mounted in the front and rear support wall (8, 9) of the support bracket housing.
5. A truck mixer according to any one of the preceding claims, characterized in that the entire support bracket (4) is formed as a housing box with a support wall (45, 46) at the front and the rear, side members (47) and an upper cover wall (10) having the roll through-passage openings (22), wherein at the lower end of the housing box a front and rear bearing part (48) for fastening the support bracket to the vehicle frame is provided in each case on both sides of the support bracket.
6. A truck mixer according to any one of the preceding claims, characterized in that a recess (50), which is preferably formed in the manner of a tunnel and which divides the lower housing portion of the support bracket into two lateral support bracket legs (49) at the ends of which are arranged the bearing parts (48) for fastening the support bracket to the vehicle frame, is provided in the lower support bracket portion, preferably at the front.
7. A truck mixer according to claim 6, characterized in that the recess (50) extends through the support bracket in the longitudinal direction.
8. A truck mixer according to claim 6 or 7, characterized in that the recess is made substantially U-shaped and preferably edge-free over the periphery.
9. A truck mixer according to any one of the preceding claims, characterized in that the rear support bracket (4) is made displaceable in the longitudinal direction of the vehicle frame (2) and capable of being tilted away from the vehicle frame.
10. A truck mixer according to claim 9, characterized in that the front support bracket (3) is made capable of being tilted away from the vehicle frame.
11. A truck mixer according to any one of the preceding claims, characterized in that the rolls (7) are supported by a one pin (23) in each case, wherein at least one roller bearing (33) with an inner and an outer ring (36) and with roller bodies (35) arranged between them is provided between the pin (23) and the roll body (32), wherein the inner ring of the roller bearing (33) is arranged immediately coaxially around the pin (23) in the inserted state.
12. A truck mixer according to any one of the preceding claims, characterized in that the pins (23) supporting the rolls (7) are mounted in one opening (24, 25) in each case in the support bracket wall at the front and the rear.
13. A truck mixer according to any one of the preceding claims, characterized in that the pin (23) is a step pin, and the thinner end of the pin (23) has an external thread (30) into which a slotted nut (31) is arranged so as to engage.
14. A truck mixer according to any one of the preceding claims, characterized in that openings, preferably lateral openings, are provided in the support bracket (4) in order to change the roll bodies (32) which are preferably capable of being closed by means of plates (14) capable of being bolted to the support bracket (4).
15. A truck mixer according to any one of the preceding claims, characterized in that the support bracket (4) extends upwards on both sides into one support arm (11) in each case, in particular for holding the filling funnel and the outflow dish, wherein the upper edge line (37, 38) of the support bracket face (45) at the rear and/or the support bracket face (44) at the front is or are swung in substantially a U shape or contoured in substantially a V shape in a manner adapted to the periphery of the mixing drum.
16. A truck mixer according to any one of the preceding claims, characterized in that the support bracket wall (39, 45) at the rear and the support bracket wall (8, 44) at the front are joined, and in particular welded, to the lateral edges of the cover wall forming the U-shaped or V-shaped upper support bracket face (10), preferably over the entire edge length.
17. A truck mixer according to any one of the preceding claims, characterized in that the support bracket structure is displaced with respect to the vehicle frame over a 3-point mounting.
18. A truck mixer according to claim 17, characterized in that the support bracket structure has two lateral mounting points (48) for mounting on the vehicle frame and a mounting point (61) arranged substantially in the middle for mounting on the vehicle frame, wherein the mounting point (61) arranged substantially in the middle is preferably arranged in the front region of the support bracket structure.
19. A truck mixer according to claim 17 or 18, characterized in that the support bracket structure is formed with a hood-like front portion (60), preferably in the form of a pyramid or funnel, at the front end of which the mounting point (61) is formed.
20. A truck mixer according to any one of claims 17 to 19, characterized in that the mounting points (48) for attachment to the longitudinal supports are formed by a tube or pin passing through the support bracket structure and the front mounting point (61) is formed by a bearing pin in the manner of an axle stub, a universal joint or a resilient bearing which is displaced on a cross member spanning the longitudinal supports.

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