DE202020103498U1 - Truck mixer with electric mixer drum drive - Google Patents

Abstract

Truck mixer (10) with a chassis (12) and a mixer assembly (14) attached to it, the mixer assembly (14) having an auxiliary frame (16) fastened to the chassis (12) and one to the auxiliary frame (16) via a rear and a front drum bearing block (20, 22) attached mixing drum (18), an electric motor (24) by means of which the mixing drum (18) can be driven in rotation, and a battery (30) by means of which the electric motor (24) can be supplied with energy, thereby characterized in that the battery (30) is slidably mounted in the area of the rear drum bearing block (22).

Description

The present invention relates to a truck mixer according to the preamble of claim 1 as well as a mixer structure and a set comprising a carrier and a battery that can be mounted on it for such a truck mixer.

Truck mixers, also known colloquially as concrete mixers, are used to transport concrete and usually have a mixer structure placed on a conventional truck chassis. The latter comprises a rotatable mixing drum in which the concrete to be transported is located and which can be set in rotation via a drive unit. Hydraulic and electrical drives are known from the prior art as drum drive units.

In the case of hydraulically driven mixing drums, the hydraulic volume flow and pressure are typically generated via a hydraulic variable displacement pump which is permanently connected to a power take-off of the truck mixer engine (or truck engine) via a cardan shaft. Hydraulic pressure and volume flow are converted into a rotary movement by a hydraulic motor, which is usually connected to the mixing drum via a gearbox. In addition to transmitting the rotational movement from the hydraulic motor to the mixing drum, the gearbox also serves as a torque transmission. Due to the power density of the hydraulics, the components are designed and arranged very compactly. If the mixing drum is rotating, the truck engine must always be in operation so that the hydraulic pump can drive the hydraulic motor and thus the mixing drum.

In the case of electrically driven mixing drums, on the other hand, the drive energy comes from a battery or a generator. Like the hydraulic pump, the generator is firmly connected to a truck power take-off via a cardan shaft. Typically, the battery is positioned near the mixer drum drive, directly behind the truck mixer cab, with the generator directly below it. Alternatively, a battery arrangement on the side of the mixer drive is known.

The installation position of the battery transversely behind the driver's cab ensures that the mixer assembly has to be moved further back towards the rear of the vehicle due to the space required by the battery. This is reinforced by the fact that the electrical components, power electronics, motor, generator and battery require more installation space compared to a hydraulic drive system. Thus, with the known arrangement, a longer truck mixer or a longer truck chassis must be used, which is more difficult to maneuver in inner-city areas or on narrow construction sites and leads to losses in maneuverability.

In addition, the components of the electric drive system are usually heavier than corresponding hydraulic components. Since all electrical components, including the battery, are located in the front area of the truck mixer, there is an increased load on the front axle and, as a result, an unfavorable axle load distribution. In this regard, too, one consequence is that the mixer body has to be moved backwards in order to meet the statutory axle load specifications, which has disadvantages in terms of the maneuverability of the truck mixer and the loss of payload resulting from the extra weight.

Against this background, the present invention is based on the object of providing a truck mixer with an electrically driven mixing drum, which has a space-saving structure and an optimized axle load.

According to the invention, this object is achieved by a truck mixer having the features of claim 1. Advantageous embodiments of the invention emerge from the subclaims and the following description.

Accordingly, the truck mixer according to the invention has a chassis, in particular a truck chassis, and a mixer structure attached to it. The mixer structure comprises an auxiliary frame fastened to the chassis, a mixing drum fastened to the auxiliary frame via two drum bearing blocks - namely a rear and a front drum bearing block - an electric motor by means of which the mixing drum can be driven in rotation, and a battery by means of which the electric motor can be supplied with energy . According to the invention, the battery is slidably mounted in the area of the rear drum bearing block.

The placement of the battery in the rear area of the mixer structure or in the area of the rear drum bearing block results in a significantly improved axle load distribution, which is almost identical to a normal concrete mixer chassis in particular. With this structure, a conventional truck chassis can be used as the chassis, since the mixer structure does not have to be moved backwards due to the smaller space requirement in the area of the driver's cab, which results in better maneuverability of the truck mixer. The movable mounting of the battery ensures that it can be easily reached if required, even if it is installed in the rear area of the truck mixer. This structure allows quick and easy installation of the battery in the vehicle. In the event of service, the battery can be quickly replaced, which is why contributes to an enormous reduction in tool life losses.

In one embodiment it is provided that the battery can be releasably fixed in a working position which is preferably located below the rear drum bearing block. The work position is the installation position provided for the battery for supplying energy or current to the electric motor during work.

In a further embodiment it is provided that the subframe comprises two longitudinal members extending along the longitudinal axis of the chassis, the battery being arranged between the longitudinal members. The longitudinal beams can be U-shaped profile elements, which can also be connected to one another by transverse elements. In particular, the side members run parallel to one another along the chassis and are mounted on it. The drum pedestals are particularly attached to the side members. The storage of the battery between the longitudinal members results in a space-saving structure, since an installation space that is already available and limited by the longitudinal members is used. Due to the arrangement between the side members and below the rear drum bearing block, the battery is also stored in a protected manner.

In a further embodiment it is provided that the battery is mounted displaceably along the longitudinal axis of the chassis. In particular, the battery can be displaced along the subframe or along the side members of the subframe. As a result, there is no need to make any complex modifications to the mixer structure or the subframe in order to be able to accommodate the battery in a displaceable manner.

In a further embodiment it is provided that the battery can be displaced from a working position to the rear in the direction of the rear of the vehicle and can be removed from the mixer structure.

In a further embodiment it is provided that the electric motor is arranged in the area of the front drum bearing block. This results in an optimal axle load distribution and the familiar structure of the electric mixing drum drive can be used (apart from the arrangement of the battery). The electric motor is connected to the mixing drum in particular via a gear mechanism which serves to transmit the rotational movement from the electric motor to the mixing drum and as a torque transmission.

In a further embodiment, a generator is provided which, for example via a cardan shaft, is or can be connected to an output shaft of an internal combustion engine of the truck mixer, the electric motor and / or the battery being able to be supplied with energy by means of the generator. The generator is preferably set up to charge the battery while the truck mixer is in motion and is arranged in particular in the area of the front drum bearing block. Furthermore, the generator can directly provide energy for the electric motor.

In a further embodiment it is provided that the battery is slidably mounted on the subframe or on the rear drum bearing block.

A truck mixer is also used as a construction machine on difficult, uneven terrain. This uneven terrain can cause twisting on the chassis, which is also transferred to the mixer body. If the battery is firmly connected to the chassis or the subframe of the mixer body, the torsional forces can be transferred to the battery housing and thereby loosening the connection or fastening of the battery or causing cracks in the battery housing and thus damaging the components up to a total failure of the battery to lead.

In a preferred embodiment it is therefore provided that the battery is fastened to the rear drum bearing block by being slidably mounted on a carrier which is fastened to the rear drum bearing block. In particular, the carrier is not attached to the subframe. This makes it possible to store the battery as torsionally decoupled as possible on or in the mixer assembly. This decoupling greatly reduces the twisting forces on the battery and prevents damage to the battery housing. The battery is preferably suspended from the carrier and is mounted so as to be displaceable relative to the latter. The carrier furthermore preferably comprises two carrier elements which are fastened laterally to the rear drum bearing block. Ideally, the fastening points of the carrier or the carrier elements on the rear drum bearing block have a large spacing (that is to say essentially the entire width of the drum bearing block at the height of the fastening of the carrier). This makes it possible to almost completely decouple the battery from twisting in the subframe.

In a further embodiment it is provided that the carrier has guide rails in / on which the battery is slidably mounted via guide rail supports attached to the battery. The guide rails are provided in particular on the carrier elements of the carrier. The guide rail supports are preferably arranged on the side of the battery housing and slide in / on the guide rails. But it is also possible that the battery is mounted on or on a frame or a table, which / which is provided with the guide rail supports and is slidably mounted on the carrier. The rail guide system enables the battery to be pushed in and out or installed quickly and easily. In the event of service, the battery can be exchanged quickly, which leads to reduced downtime losses.

In a further embodiment it is provided that the guide rails have at least one bore which covers a corresponding bore of the guide rail supports in a working position of the battery, the battery being reversibly fixable in the working position by inserting and / or screwing at least one fixing element into the bores. This makes it particularly easy to fix or lock the battery after it has been inserted. The fixation prevents the battery from slipping out of the working position while the truck mixer is in operation. Preferably, at least one hole is provided for each rail and a corresponding hole is also provided for each guide rail support in order to enable the battery to be fixed in a more stable manner. The holes can be smooth holes or threaded holes. In the latter case, fixation takes place via a screw connection or screw connection. Locking by inserting a locking bolt is also conceivable.

The present invention also relates to a mixer assembly for a truck mixer according to the invention. This can in particular be attached to a conventional truck chassis or chassis. This obviously results in the same advantages and properties as for the truck mixer according to the invention, which is why repetitive explanations are dispensed with at this point.

The present invention also relates to a set of a carrier that can be fastened to the rear drum bearing block, in particular comprising two carrier elements, and a battery for a truck mixer according to the invention that can be slidably mounted on the carrier or carrier elements. The above-described design options for the carrier and the battery with regard to their storage on the carrier (for example via a rail guide system) also apply to the set according to the invention.

• 1: ein bevorzugtes Ausführungsbeispiel des erfindungsgemäßen Fahrmischers in einer Seitenansicht;
• 2: einen Teil des Mischeraufbaus des Fahrmischers ohne Mischtrommel in einer perspektivischen Ansicht;
• 3: den hinteren Bereich des Hilfsrahmens mit hinterem Trommellagerbock und eingebauter Batterie in einer perspektivischen Ansicht;
• 4: den hinteren Trommellagerbock gemäß 3 in einer Seitenansicht;
• 5: den hinteren Trommellagerbock gemäß 3 mit ausgeschobener Batterie; und
• 6: den Träger und die Batterie in perspektivischen Einzelansichten.

Further features, details and advantages of the invention emerge from the exemplary embodiment explained below with reference to the figures. Show it:

• 1 : a preferred embodiment of the mixer truck according to the invention in a side view;
• 2 : a part of the mixer structure of the truck mixer without mixing drum in a perspective view;
• 3 : the rear area of the subframe with rear drum bearing block and built-in battery in a perspective view;
• 4th : the rear drum pedestal according to 3 in a side view;
• 5 : the rear drum pedestal according to 3 with extended battery; and
• 6th : the carrier and the battery in individual perspective views.

In the 1 is an embodiment of the mixer truck according to the invention 10 shown as an overall representation in a side view. The truck mixer 10 includes a chassis 12th with four-axle chassis and a driver's cab located at the front of the vehicle 11 . With the chassis 12th including driver's cab 11 it is in particular a conventional truck chassis. Instead of the four-axle chassis shown here, other chassis or chassis configurations and sizes can of course also be used.

On the chassis 12th is a mixer assembly 14th arranged, which one on the chassis 12th attached subframe 16 , one on a front and a rear drum pedestal 20th , 22nd rotatably mounted mixing drum 18th for storing and transporting concrete as well as a drive system by means of which the mixing drum 18th is set in rotation includes. Further components of the mixer assembly 14th such as a concrete chute arranged at the rear of the vehicle and a side ladder are also visible.

the 2 shows a section of the mixer structure 14th without mixing drum 18th in a perspective view. The subframe 16 includes two parallel and essentially along the entire length of the chassis 12th running longitudinal beams 17th from the rear of the vehicle to just behind the driver's cab 11 run and on the chassis 12th are attached. The side members 17th are designed as U-profiles. The front drum bracket 20th is located behind the driver's cab 11 , while the rear drum pedestal 22nd at the rear end of the sub-beam 16 is arranged in the area of the rear of the vehicle.

The mixing drum 18th is driven by an electric drive system, which is an electric motor 24 for the rotary drive of the Mixing drum 18th , one between electric motor 24 and mixing drum 18th arranged gearbox (not shown) for the transmission of rotational movement and torque transmission, a generator coupled to a power take-off of the truck engine 26th below the electric motor 24 as well as a battery 30th includes. The electric motor 24 is from the battery 30th and possibly from the generator 26th powered while the generator 26th can be set up the battery 30th charge while driving. The electric motor 24 , the generator 26th as well as power electronics 28 are in the area of the front drum pedestal 20th behind the driver's cab 11 arranged.

In comparison to generic electric drive systems, the battery is located 30th of the truck mixer 10 according to the invention not also in the area of the front drum bearing block 20th , but on the rear of the vehicle in the area of the rear drum bearing block 22nd . This results in an optimal axle load distribution, so that the mixer structure 14th close to the driver's cab 11 and a conventional LWK chassis can be used. In addition, the balanced axle load distribution protects the chassis. According to the invention is the battery 30th relative to the subframe 16 slidably mounted to allow easy assembly / replacement.

the 3 and 4th show a section of the subframe 16 with it on the side fastenings 23 mounted rear drum pedestal 22nd in a perspective and a side view. At the fortifications 23 of the rear drum pedestal 22nd it can be fasteners as they are in the EP 3 222 396 A1 are disclosed, to which reference is explicitly made at this point. The battery 30th is in the working position (in which it operates the electric motor 24 with power and possibly with connections for external charging of the battery 30th connected / connectable) directly below the rear drum bearing block 22nd and between the side members 17th . The battery 30th is on a carrier 32 suspended, which two elongated, parallel support elements 34 includes the side of the rear drum bracket 22nd are mounted.

The attachment points 35 of the support elements 34 show a large distance A. on, which is essentially the length of the rear drum pedestal 22nd at the height of the fastening points 35 is equivalent to. The attachment points 35 of the support elements 34 are located in the area of the fastenings 23 of the rear drum pedestal 22nd on the subframe 16 . The support elements 34 are in this embodiment directly above the side members 17th of the subframe 16 arranged, but only with the rear drum pedestal 22nd firmly connected.

The battery 30th so is not on the subframe 16 , but on the rear drum bearing block 22nd stored. Due to this arrangement and the large distance A. the attachment points 35 This results in a largely torsion-free suspension of the battery 30th in the mixer assembly 14th through which the on the subframe 16 acting torsional forces from the battery 30th greatly reduced or decoupled, thereby preventing damage to the battery housing.

the 5 shows the arrangement 3 , with the battery 30th is extended or pushed out of the working position in the direction of the rear of the vehicle. The direction in which the battery is pushed in and out or the direction in which it is installed 30th is by means of the double arrow M. illustrated. The carrier 32 and the battery 30th are in the 6th shown individually. As can be seen in the figures, the support elements 34 to that of the battery 30th facing inner sides guide rails 36 on, which are located essentially along the longitudinal axes of the carrier elements 34 extend. The battery housing points to the side members, the side members 17th facing outsides guide rail supports 38 in or on the guide rails 36 of the wearer 32 slide. This is the battery 30th on the carrier 32 movably mounted. This rail guide system makes it quick and easy to install or replace the battery 30th guaranteed.

To the battery 30th in the working position (cf. 3 ) to be able to fix, show the guide rails 36 and the guide rail supports 38 several screw holes 40 , 42 on that in the working position of the battery 30th overlap each other and allow a fixing element (for example a screw) to be screwed in. Of course, other fixing options are also conceivable here, for example by means of bolts, clips, snap-in connections or the like. In this exemplary embodiment, the battery housing also has a stepped structure in order to allow space-saving installation below the rear drum bearing block 22nd to allow the flatter part of the battery 30th towards the driver's cab 11 about the carrier 32 or the rear drum bracket 22nd protrudes. This is the dimensioning of the battery 30th not by the dimensions of the rear drum pedestal 22nd limited.

List of reference symbols

10

Truck mixer

11

Driver's cab

12th

chassis

14th

Mixer assembly

16

Subframe

17th

Side member

18th

Mixing drum

20th

Front drum pedestal

22nd

Rear drum bracket

23

Attachment

24

Electric motor

26th

generator

28

Power electronics

30th

battery

32

carrier

34

Support element

35

Attachment point

36

Guide rail

38

Guide rail support

40

drilling

42

drilling

A.

Distance between fastening points

M.

Mounting direction

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• EP 3222396 A1 [0030]

Claims (13)

Truck mixer (10) with a chassis (12) and a mixer assembly (14) attached to it, the mixer assembly (14) having an auxiliary frame (16) fastened to the chassis (12) and one to the auxiliary frame (16) via a rear and a front drum bearing block (20, 22) attached mixing drum (18), an electric motor (24) by means of which the mixing drum (18) can be driven in rotation, and a battery (30) by means of which the electric motor (24) can be supplied with energy, thereby characterized in that the battery (30) is slidably mounted in the area of the rear drum bearing block (22). Mixer truck (10) Claim 1 , characterized in that the battery (30) can be releasably fixed in a working position which is preferably located below the rear drum bearing block (22). Mixer truck (10) Claim 1 or 2 , characterized in that the subframe (16) comprises two longitudinal beams (17) extending along the longitudinal axis of the chassis (12), the battery (30) being arranged between the longitudinal beams (17). Truck mixer (10) according to one of the preceding claims, characterized in that the battery (30) is mounted displaceably along the longitudinal axis of the chassis (12). Truck mixer (10) according to one of the preceding claims, characterized in that the battery (30) can be displaced from a working position to the rear in the direction of the rear of the vehicle and can be removed from the mixer structure (14). Truck mixer (10) according to one of the preceding claims, characterized in that the electric motor (24) is arranged in the area of the front drum bearing block (20). Truck mixer (10) according to one of the preceding claims, characterized in that a generator (26) is provided, in particular in the area of the front drum bearing block (20), which is connected or can be connected to an output shaft of an internal combustion engine of the truck mixer (10), whereby by means of of the generator (26), the electric motor (24) and / or the battery (30) can be supplied with energy. Truck mixer (10) according to one of the preceding claims, characterized in that the battery (30) is displaceably mounted on the auxiliary frame (16) or on the rear drum bearing block (22). Truck mixer (10) according to one of the preceding claims, characterized in that the battery (30) is displaceably mounted, in particular suspended, on a carrier (32) which is fastened to the rear drum bearing block (22), the carrier (32) preferably two Includes support elements (34) which are laterally attached to the rear drum bearing block (22). Mixer truck (10) Claim 9 , characterized in that the carrier (32) has guide rails (36) in / on which the battery (30) is slidably mounted via guide rail supports (38) attached to the battery (30). Mixer truck (10) Claim 10 , characterized in that the guide rails (36) have at least one hole (40) which, in a working position of the battery (30), covers a corresponding hole (42) in the guide rail supports (38), the battery (30) passing through in the working position Inserting and / or screwing at least one fixing element into the bores (40, 42) can be reversibly fixed. Mixer assembly for a truck mixer (10) according to one of the preceding claims. Set of a carrier (32) and a battery (30) for a truck mixer (10) according to one of the Claims 9 until 11 .

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